pdfjs-dist/web/pdf_viewer.js.map

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specific language governing permissions and\n * limitations under the License.\n */\n/* eslint-disable no-unused-vars */\n\nimport {\n  AnnotationLayerBuilder, DefaultAnnotationLayerFactory\n} from './annotation_layer_builder.js';\nimport {\n  DefaultTextLayerFactory, TextLayerBuilder\n} from './text_layer_builder.js';\nimport {\n  EventBus, getGlobalEventBus, NullL10n, ProgressBar\n} from './ui_utils.js';\nimport { PDFLinkService, SimpleLinkService } from './pdf_link_service.js';\nimport { DownloadManager } from './download_manager.js';\nimport { GenericL10n } from './genericl10n.js';\nimport { PDFFindController } from './pdf_find_controller.js';\nimport { PDFHistory } from './pdf_history.js';\nimport { PDFPageView } from './pdf_page_view.js';\nimport { PDFSinglePageViewer } from './pdf_single_page_viewer';\nimport { PDFViewer } from './pdf_viewer.js';\n\nconst pdfjsVersion = PDFJSDev.eval('BUNDLE_VERSION');\nconst pdfjsBuild = PDFJSDev.eval('BUNDLE_BUILD');\n\n// For backwards 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language governing permissions and\n * limitations under the License.\n */\n\nimport { AnnotationLayer } from 'pdfjs-lib';\nimport { NullL10n } from './ui_utils';\nimport { SimpleLinkService } from './pdf_link_service';\n\n/**\n * @typedef {Object} AnnotationLayerBuilderOptions\n * @property {HTMLDivElement} pageDiv\n * @property {PDFPage} pdfPage\n * @property {string} imageResourcesPath - (optional) Path for image resources,\n *   mainly for annotation icons. Include trailing slash.\n * @property {boolean} renderInteractiveForms\n * @property {IPDFLinkService} linkService\n * @property {DownloadManager} downloadManager\n * @property {IL10n} l10n - Localization service.\n */\n\nclass AnnotationLayerBuilder {\n  /**\n   * @param {AnnotationLayerBuilderOptions} options\n   */\n  constructor({ pageDiv, pdfPage, linkService, downloadManager,\n                imageResourcesPath = '', renderInteractiveForms = false,\n                l10n = NullL10n, }) {\n    this.pageDiv = pageDiv;\n    this.pdfPage = pdfPage;\n    this.linkService = linkService;\n    this.downloadManager = downloadManager;\n    this.imageResourcesPath = imageResourcesPath;\n    this.renderInteractiveForms = renderInteractiveForms;\n    this.l10n = l10n;\n\n    this.div = null;\n    this._cancelled = false;\n  }\n\n  /**\n   * @param {PageViewport} viewport\n   * @param {string} intent (default value is 'display')\n   */\n  render(viewport, intent = 'display') {\n    this.pdfPage.getAnnotations({ intent, }).then((annotations) => {\n      if (this._cancelled) {\n        return;\n      }\n\n      let parameters = {\n        viewport: viewport.clone({ dontFlip: true, }),\n        div: this.div,\n        annotations,\n        page: this.pdfPage,\n        imageResourcesPath: this.imageResourcesPath,\n        renderInteractiveForms: this.renderInteractiveForms,\n        linkService: this.linkService,\n        downloadManager: this.downloadManager,\n      };\n\n      if (this.div) {\n        // If an annotationLayer already exists, refresh its children's\n        // transformation matrices.\n        AnnotationLayer.update(parameters);\n      } else {\n        // Create an annotation layer div and render the annotations\n        // if there is at least one annotation.\n        if (annotations.length === 0) {\n          return;\n        }\n        this.div = document.createElement('div');\n        this.div.className = 'annotationLayer';\n        this.pageDiv.appendChild(this.div);\n        parameters.div = this.div;\n\n        AnnotationLayer.render(parameters);\n        this.l10n.translate(this.div);\n      }\n    });\n  }\n\n  cancel() {\n    this._cancelled = true;\n  }\n\n  hide() {\n    if (!this.div) {\n      return;\n    }\n    this.div.setAttribute('hidden', 'true');\n  }\n}\n\n/**\n * @implements IPDFAnnotationLayerFactory\n */\nclass DefaultAnnotationLayerFactory {\n  /**\n   * @param {HTMLDivElement} pageDiv\n   * @param {PDFPage} pdfPage\n   * @param {string} imageResourcesPath - (optional) Path for image resources,\n   *   mainly for annotation icons. Include trailing slash.\n   * @param {boolean} renderInteractiveForms\n   * @param {IL10n} l10n\n   * @returns {AnnotationLayerBuilder}\n   */\n  createAnnotationLayerBuilder(pageDiv, pdfPage, imageResourcesPath = '',\n                               renderInteractiveForms = false,\n                               l10n = NullL10n) {\n    return new AnnotationLayerBuilder({\n      pageDiv,\n      pdfPage,\n      imageResourcesPath,\n      renderInteractiveForms,\n      linkService: new SimpleLinkService(),\n      l10n,\n    });\n  }\n}\n\nexport {\n  AnnotationLayerBuilder,\n  DefaultAnnotationLayerFactory,\n};\n","/* Copyright 2016 Mozilla Foundation\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *     http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n/* globals module, __non_webpack_require__ */\n\n'use strict';\n\nlet pdfjsLib;\nif (typeof window !== 'undefined' && window['pdfjs-dist/build/pdf']) {\n  pdfjsLib = window['pdfjs-dist/build/pdf'];\n} else {\n  pdfjsLib = __non_webpack_require__('../build/pdf.js');\n}\nmodule.exports = pdfjsLib;\n","/* Copyright 2012 Mozilla Foundation\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *     http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nconst CSS_UNITS = 96.0 / 72.0;\nconst DEFAULT_SCALE_VALUE = 'auto';\nconst DEFAULT_SCALE = 1.0;\nconst MIN_SCALE = 0.10;\nconst MAX_SCALE = 10.0;\nconst UNKNOWN_SCALE = 0;\nconst MAX_AUTO_SCALE = 1.25;\nconst SCROLLBAR_PADDING = 40;\nconst VERTICAL_PADDING = 5;\n\nconst PresentationModeState = {\n  UNKNOWN: 0,\n  NORMAL: 1,\n  CHANGING: 2,\n  FULLSCREEN: 3,\n};\n\nconst RendererType = {\n  CANVAS: 'canvas',\n  SVG: 'svg',\n};\n\nconst TextLayerMode = {\n  DISABLE: 0,\n  ENABLE: 1,\n  ENABLE_ENHANCE: 2,\n};\n\nconst ScrollMode = {\n  UNKNOWN: -1,\n  VERTICAL: 0, // Default value.\n  HORIZONTAL: 1,\n  WRAPPED: 2,\n};\n\nconst SpreadMode = {\n  UNKNOWN: -1,\n  NONE: 0, // Default value.\n  ODD: 1,\n  EVEN: 2,\n};\n\n// Replaces {{arguments}} with their values.\nfunction formatL10nValue(text, args) {\n  if (!args) {\n    return text;\n  }\n  return text.replace(/\\{\\{\\s*(\\w+)\\s*\\}\\}/g, (all, name) => {\n    return (name in args ? args[name] : '{{' + name + '}}');\n  });\n}\n\n/**\n * No-op implementation of the localization service.\n * @implements {IL10n}\n */\nlet NullL10n = {\n  async getLanguage() {\n    return 'en-us';\n  },\n\n  async getDirection() {\n    return 'ltr';\n  },\n\n  async get(property, args, fallback) {\n    return formatL10nValue(fallback, args);\n  },\n\n  async translate(element) { },\n};\n\n/**\n * Returns scale factor for the canvas. It makes sense for the HiDPI displays.\n * @return {Object} The object with horizontal (sx) and vertical (sy)\n                    scales. The scaled property is set to false if scaling is\n                    not required, true otherwise.\n */\nfunction getOutputScale(ctx) {\n  let devicePixelRatio = window.devicePixelRatio || 1;\n  let backingStoreRatio = ctx.webkitBackingStorePixelRatio ||\n                          ctx.mozBackingStorePixelRatio ||\n                          ctx.msBackingStorePixelRatio ||\n                          ctx.oBackingStorePixelRatio ||\n                          ctx.backingStorePixelRatio || 1;\n  let pixelRatio = devicePixelRatio / backingStoreRatio;\n  return {\n    sx: pixelRatio,\n    sy: pixelRatio,\n    scaled: pixelRatio !== 1,\n  };\n}\n\n/**\n * Scrolls specified element into view of its parent.\n * @param {Object} element - The element to be visible.\n * @param {Object} spot - An object with optional top and left properties,\n *   specifying the offset from the top left edge.\n * @param {boolean} skipOverflowHiddenElements - Ignore elements that have\n *   the CSS rule `overflow: hidden;` set. The default is false.\n */\nfunction scrollIntoView(element, spot, skipOverflowHiddenElements = false) {\n  // Assuming offsetParent is available (it's not available when viewer is in\n  // hidden iframe or object). We have to scroll: if the offsetParent is not set\n  // producing the error. See also animationStarted.\n  let parent = element.offsetParent;\n  if (!parent) {\n    console.error('offsetParent is not set -- cannot scroll');\n    return;\n  }\n  let offsetY = element.offsetTop + element.clientTop;\n  let offsetX = element.offsetLeft + element.clientLeft;\n  while ((parent.clientHeight === parent.scrollHeight &&\n          parent.clientWidth === parent.scrollWidth) ||\n         (skipOverflowHiddenElements &&\n          getComputedStyle(parent).overflow === 'hidden')) {\n    if (parent.dataset._scaleY) {\n      offsetY /= parent.dataset._scaleY;\n      offsetX /= parent.dataset._scaleX;\n    }\n    offsetY += parent.offsetTop;\n    offsetX += parent.offsetLeft;\n    parent = parent.offsetParent;\n    if (!parent) {\n      return; // no need to scroll\n    }\n  }\n  if (spot) {\n    if (spot.top !== undefined) {\n      offsetY += spot.top;\n    }\n    if (spot.left !== undefined) {\n      offsetX += spot.left;\n      parent.scrollLeft = offsetX;\n    }\n  }\n  parent.scrollTop = offsetY;\n}\n\n/**\n * Helper function to start monitoring the scroll event and converting them into\n * PDF.js friendly one: with scroll debounce and scroll direction.\n */\nfunction watchScroll(viewAreaElement, callback) {\n  let debounceScroll = function(evt) {\n    if (rAF) {\n      return;\n    }\n    // schedule an invocation of scroll for next animation frame.\n    rAF = window.requestAnimationFrame(function viewAreaElementScrolled() {\n      rAF = null;\n\n      let currentX = viewAreaElement.scrollLeft;\n      let lastX = state.lastX;\n      if (currentX !== lastX) {\n        state.right = currentX > lastX;\n      }\n      state.lastX = currentX;\n      let currentY = viewAreaElement.scrollTop;\n      let lastY = state.lastY;\n      if (currentY !== lastY) {\n        state.down = currentY > lastY;\n      }\n      state.lastY = currentY;\n      callback(state);\n    });\n  };\n\n  let state = {\n    right: true,\n    down: true,\n    lastX: viewAreaElement.scrollLeft,\n    lastY: viewAreaElement.scrollTop,\n    _eventHandler: debounceScroll,\n  };\n\n  let rAF = null;\n  viewAreaElement.addEventListener('scroll', debounceScroll, true);\n  return state;\n}\n\n/**\n * Helper function to parse query string (e.g. ?param1=value&parm2=...).\n */\nfunction parseQueryString(query) {\n  let parts = query.split('&');\n  let params = Object.create(null);\n  for (let i = 0, ii = parts.length; i < ii; ++i) {\n    let param = parts[i].split('=');\n    let key = param[0].toLowerCase();\n    let value = param.length > 1 ? param[1] : null;\n    params[decodeURIComponent(key)] = decodeURIComponent(value);\n  }\n  return params;\n}\n\n/**\n * Use binary search to find the index of the first item in a given array which\n * passes a given condition. The items are expected to be sorted in the sense\n * that if the condition is true for one item in the array, then it is also true\n * for all following items.\n *\n * @returns {Number} Index of the first array element to pass the test,\n *                   or |items.length| if no such element exists.\n */\nfunction binarySearchFirstItem(items, condition) {\n  let minIndex = 0;\n  let maxIndex = items.length - 1;\n\n  if (items.length === 0 || !condition(items[maxIndex])) {\n    return items.length;\n  }\n  if (condition(items[minIndex])) {\n    return minIndex;\n  }\n\n  while (minIndex < maxIndex) {\n    let currentIndex = (minIndex + maxIndex) >> 1;\n    let currentItem = items[currentIndex];\n    if (condition(currentItem)) {\n      maxIndex = currentIndex;\n    } else {\n      minIndex = currentIndex + 1;\n    }\n  }\n  return minIndex; /* === maxIndex */\n}\n\n/**\n *  Approximates float number as a fraction using Farey sequence (max order\n *  of 8).\n *  @param {number} x - Positive float number.\n *  @returns {Array} Estimated fraction: the first array item is a numerator,\n *                   the second one is a denominator.\n */\nfunction approximateFraction(x) {\n  // Fast paths for int numbers or their inversions.\n  if (Math.floor(x) === x) {\n    return [x, 1];\n  }\n  let xinv = 1 / x;\n  let limit = 8;\n  if (xinv > limit) {\n    return [1, limit];\n  } else if (Math.floor(xinv) === xinv) {\n    return [1, xinv];\n  }\n\n  let x_ = x > 1 ? xinv : x;\n  // a/b and c/d are neighbours in Farey sequence.\n  let a = 0, b = 1, c = 1, d = 1;\n  // Limiting search to order 8.\n  while (true) {\n    // Generating next term in sequence (order of q).\n    let p = a + c, q = b + d;\n    if (q > limit) {\n      break;\n    }\n    if (x_ <= p / q) {\n      c = p; d = q;\n    } else {\n      a = p; b = q;\n    }\n  }\n  let result;\n  // Select closest of the neighbours to x.\n  if (x_ - a / b < c / d - x_) {\n    result = x_ === x ? [a, b] : [b, a];\n  } else {\n    result = x_ === x ? [c, d] : [d, c];\n  }\n  return result;\n}\n\nfunction roundToDivide(x, div) {\n  let r = x % div;\n  return r === 0 ? x : Math.round(x - r + div);\n}\n\n/**\n * Gets the size of the specified page, converted from PDF units to inches.\n * @param {Object} An Object containing the properties: {Array} `view`,\n *   {number} `userUnit`, and {number} `rotate`.\n * @return {Object} An Object containing the properties: {number} `width`\n *   and {number} `height`, given in inches.\n */\nfunction getPageSizeInches({ view, userUnit, rotate, }) {\n  const [x1, y1, x2, y2] = view;\n  // We need to take the page rotation into account as well.\n  const changeOrientation = rotate % 180 !== 0;\n\n  const width = (x2 - x1) / 72 * userUnit;\n  const height = (y2 - y1) / 72 * userUnit;\n\n  return {\n    width: (changeOrientation ? height : width),\n    height: (changeOrientation ? width : height),\n  };\n}\n\n/**\n * Helper function for getVisibleElements.\n *\n * @param {number} index - initial guess at the first visible element\n * @param {Array} views - array of pages, into which `index` is an index\n * @param {number} top - the top of the scroll pane\n * @returns {number} less than or equal to `index` that is definitely at or\n *   before the first visible element in `views`, but not by too much. (Usually,\n *   this will be the first element in the first partially visible row in\n *   `views`, although sometimes it goes back one row further.)\n */\nfunction backtrackBeforeAllVisibleElements(index, views, top) {\n  // binarySearchFirstItem's assumption is that the input is ordered, with only\n  // one index where the conditions flips from false to true: [false ...,\n  // true...]. With vertical scrolling and spreads, it is possible to have\n  // [false ..., true, false, true ...]. With wrapped scrolling we can have a\n  // similar sequence, with many more mixed true and false in the middle.\n  //\n  // So there is no guarantee that the binary search yields the index of the\n  // first visible element. It could have been any of the other visible elements\n  // that were preceded by a hidden element.\n\n  // Of course, if either this element or the previous (hidden) element is also\n  // the first element, there's nothing to worry about.\n  if (index < 2) {\n    return index;\n  }\n\n  // That aside, the possible cases are represented below.\n  //\n  //     ****  = fully hidden\n  //     A*B*  = mix of partially visible and/or hidden pages\n  //     CDEF  = fully visible\n  //\n  // (1) Binary search could have returned A, in which case we can stop.\n  // (2) Binary search could also have returned B, in which case we need to\n  // check the whole row.\n  // (3) Binary search could also have returned C, in which case we need to\n  // check the whole previous row.\n  //\n  // There's one other possibility:\n  //\n  //     ****  = fully hidden\n  //     ABCD  = mix of fully and/or partially visible pages\n  //\n  // (4) Binary search could only have returned A.\n\n  // Initially assume that we need to find the beginning of the current row\n  // (case 1, 2, or 4), which means finding a page that is above the current\n  // page's top. If the found page is partially visible, we're definitely not in\n  // case 3, and this assumption is correct.\n  let elt = views[index].div;\n  let pageTop = elt.offsetTop + elt.clientTop;\n\n  if (pageTop >= top) {\n    // The found page is fully visible, so we're actually either in case 3 or 4,\n    // and unfortunately we can't tell the difference between them without\n    // scanning the entire previous row, so we just conservatively assume that\n    // we do need to backtrack to that row. In both cases, the previous page is\n    // in the previous row, so use its top instead.\n    elt = views[index - 1].div;\n    pageTop = elt.offsetTop + elt.clientTop;\n  }\n\n  // Now we backtrack to the first page that still has its bottom below\n  // `pageTop`, which is the top of a page in the first visible row (unless\n  // we're in case 4, in which case it's the row before that).\n  // `index` is found by binary search, so the page at `index - 1` is\n  // invisible and we can start looking for potentially visible pages from\n  // `index - 2`. (However, if this loop terminates on its first iteration,\n  // which is the case when pages are stacked vertically, `index` should remain\n  // unchanged, so we use a distinct loop variable.)\n  for (let i = index - 2; i >= 0; --i) {\n    elt = views[i].div;\n    if (elt.offsetTop + elt.clientTop + elt.clientHeight <= pageTop) {\n      // We have reached the previous row, so stop now.\n      // This loop is expected to terminate relatively quickly because the\n      // number of pages per row is expected to be small.\n      break;\n    }\n    index = i;\n  }\n  return index;\n}\n\n/**\n * Generic helper to find out what elements are visible within a scroll pane.\n *\n * Well, pretty generic. There are some assumptions placed on the elements\n * referenced by `views`:\n *   - If `horizontal`, no left of any earlier element is to the right of the\n *     left of any later element.\n *   - Otherwise, `views` can be split into contiguous rows where, within a row,\n *     no top of any element is below the bottom of any other element, and\n *     between rows, no bottom of any element in an earlier row is below the\n *     top of any element in a later row.\n *\n * (Here, top, left, etc. all refer to the padding edge of the element in\n * question. For pages, that ends up being equivalent to the bounding box of the\n * rendering canvas. Earlier and later refer to index in `views`, not page\n * layout.)\n *\n * @param scrollEl {HTMLElement} - a container that can possibly scroll\n * @param views {Array} - objects with a `div` property that contains an\n *   HTMLElement, which should all be descendents of `scrollEl` satisfying the\n *   above layout assumptions\n * @param sortByVisibility {boolean} - if true, the returned elements are sorted\n *   in descending order of the percent of their padding box that is visible\n * @param horizontal {boolean} - if true, the elements are assumed to be laid\n *   out horizontally instead of vertically\n * @returns {Object} `{ first, last, views: [{ id, x, y, view, percent }] }`\n */\nfunction getVisibleElements(scrollEl, views, sortByVisibility = false,\n                            horizontal = false) {\n  const top = scrollEl.scrollTop, bottom = top + scrollEl.clientHeight;\n  const left = scrollEl.scrollLeft, right = left + scrollEl.clientWidth;\n\n  // Throughout this \"generic\" function, comments will assume we're working with\n  // PDF document pages, which is the most important and complex case. In this\n  // case, the visible elements we're actually interested is the page canvas,\n  // which is contained in a wrapper which adds no padding/border/margin, which\n  // is itself contained in `view.div` which adds no padding (but does add a\n  // border). So, as specified in this function's doc comment, this function\n  // does all of its work on the padding edge of the provided views, starting at\n  // offsetLeft/Top (which includes margin) and adding clientLeft/Top (which is\n  // the border). Adding clientWidth/Height gets us the bottom-right corner of\n  // the padding edge.\n  function isElementBottomAfterViewTop(view) {\n    const element = view.div;\n    const elementBottom =\n      element.offsetTop + element.clientTop + element.clientHeight;\n    return elementBottom > top;\n  }\n  function isElementRightAfterViewLeft(view) {\n    const element = view.div;\n    const elementRight =\n      element.offsetLeft + element.clientLeft + element.clientWidth;\n    return elementRight > left;\n  }\n\n  const visible = [], numViews = views.length;\n  let firstVisibleElementInd = numViews === 0 ? 0 :\n    binarySearchFirstItem(views, horizontal ? isElementRightAfterViewLeft :\n                                              isElementBottomAfterViewTop);\n\n  // Please note the return value of the `binarySearchFirstItem` function when\n  // no valid element is found (hence the `firstVisibleElementInd` check below).\n  if (firstVisibleElementInd > 0 && firstVisibleElementInd < numViews &&\n      !horizontal) {\n    // In wrapped scrolling (or vertical scrolling with spreads), with some page\n    // sizes, isElementBottomAfterViewTop doesn't satisfy the binary search\n    // condition: there can be pages with bottoms above the view top between\n    // pages with bottoms below. This function detects and corrects that error;\n    // see it for more comments.\n    firstVisibleElementInd =\n      backtrackBeforeAllVisibleElements(firstVisibleElementInd, views, top);\n  }\n\n  // lastEdge acts as a cutoff for us to stop looping, because we know all\n  // subsequent pages will be hidden.\n  //\n  // When using wrapped scrolling or vertical scrolling with spreads, we can't\n  // simply stop the first time we reach a page below the bottom of the view;\n  // the tops of subsequent pages on the same row could still be visible. In\n  // horizontal scrolling, we don't have that issue, so we can stop as soon as\n  // we pass `right`, without needing the code below that handles the -1 case.\n  let lastEdge = horizontal ? right : -1;\n\n  for (let i = firstVisibleElementInd; i < numViews; i++) {\n    const view = views[i], element = view.div;\n    const currentWidth = element.offsetLeft + element.clientLeft;\n    const currentHeight = element.offsetTop + element.clientTop;\n    const viewWidth = element.clientWidth, viewHeight = element.clientHeight;\n    const viewRight = currentWidth + viewWidth;\n    const viewBottom = currentHeight + viewHeight;\n\n    if (lastEdge === -1) {\n      // As commented above, this is only needed in non-horizontal cases.\n      // Setting lastEdge to the bottom of the first page that is partially\n      // visible ensures that the next page fully below lastEdge is on the\n      // next row, which has to be fully hidden along with all subsequent rows.\n      if (viewBottom >= bottom) {\n        lastEdge = viewBottom;\n      }\n    } else if ((horizontal ? currentWidth : currentHeight) > lastEdge) {\n      break;\n    }\n\n    if (viewBottom <= top || currentHeight >= bottom ||\n        viewRight <= left || currentWidth >= right) {\n      continue;\n    }\n\n    const hiddenHeight = Math.max(0, top - currentHeight) +\n                         Math.max(0, viewBottom - bottom);\n    const hiddenWidth = Math.max(0, left - currentWidth) +\n                        Math.max(0, viewRight - right);\n    const percent = ((viewHeight - hiddenHeight) * (viewWidth - hiddenWidth) *\n                     100 / viewHeight / viewWidth) | 0;\n    visible.push({\n      id: view.id,\n      x: currentWidth,\n      y: currentHeight,\n      view,\n      percent,\n    });\n  }\n\n  const first = visible[0], last = visible[visible.length - 1];\n\n  if (sortByVisibility) {\n    visible.sort(function(a, b) {\n      let pc = a.percent - b.percent;\n      if (Math.abs(pc) > 0.001) {\n        return -pc;\n      }\n      return a.id - b.id; // ensure stability\n    });\n  }\n  return { first, last, views: visible, };\n}\n\n/**\n * Event handler to suppress context menu.\n */\nfunction noContextMenuHandler(evt) {\n  evt.preventDefault();\n}\n\nfunction isDataSchema(url) {\n  let i = 0, ii = url.length;\n  while (i < ii && url[i].trim() === '') {\n    i++;\n  }\n  return url.substring(i, i + 5).toLowerCase() === 'data:';\n}\n\n/**\n * Returns the filename or guessed filename from the url (see issue 3455).\n * @param {string} url - The original PDF location.\n * @param {string} defaultFilename - The value returned if the filename is\n *   unknown, or the protocol is unsupported.\n * @returns {string} Guessed PDF filename.\n */\nfunction getPDFFileNameFromURL(url, defaultFilename = 'document.pdf') {\n  if (typeof url !== 'string') {\n    return defaultFilename;\n  }\n  if (isDataSchema(url)) {\n    console.warn('getPDFFileNameFromURL: ' +\n                 'ignoring \"data:\" URL for performance reasons.');\n    return defaultFilename;\n  }\n  const reURI = /^(?:(?:[^:]+:)?\\/\\/[^\\/]+)?([^?#]*)(\\?[^#]*)?(#.*)?$/;\n  //            SCHEME        HOST         1.PATH  2.QUERY   3.REF\n  // Pattern to get last matching NAME.pdf\n  const reFilename = /[^\\/?#=]+\\.pdf\\b(?!.*\\.pdf\\b)/i;\n  let splitURI = reURI.exec(url);\n  let suggestedFilename = reFilename.exec(splitURI[1]) ||\n                          reFilename.exec(splitURI[2]) ||\n                          reFilename.exec(splitURI[3]);\n  if (suggestedFilename) {\n    suggestedFilename = suggestedFilename[0];\n    if (suggestedFilename.includes('%')) {\n      // URL-encoded %2Fpath%2Fto%2Ffile.pdf should be file.pdf\n      try {\n        suggestedFilename =\n          reFilename.exec(decodeURIComponent(suggestedFilename))[0];\n      } catch (ex) { // Possible (extremely rare) errors:\n        // URIError \"Malformed URI\", e.g. for \"%AA.pdf\"\n        // TypeError \"null has no properties\", e.g. for \"%2F.pdf\"\n      }\n    }\n  }\n  return suggestedFilename || defaultFilename;\n}\n\nfunction normalizeWheelEventDelta(evt) {\n  let delta = Math.sqrt(evt.deltaX * evt.deltaX + evt.deltaY * evt.deltaY);\n  let angle = Math.atan2(evt.deltaY, evt.deltaX);\n  if (-0.25 * Math.PI < angle && angle < 0.75 * Math.PI) {\n    // All that is left-up oriented has to change the sign.\n    delta = -delta;\n  }\n\n  const MOUSE_DOM_DELTA_PIXEL_MODE = 0;\n  const MOUSE_DOM_DELTA_LINE_MODE = 1;\n  const MOUSE_PIXELS_PER_LINE = 30;\n  const MOUSE_LINES_PER_PAGE = 30;\n\n  // Converts delta to per-page units\n  if (evt.deltaMode === MOUSE_DOM_DELTA_PIXEL_MODE) {\n    delta /= MOUSE_PIXELS_PER_LINE * MOUSE_LINES_PER_PAGE;\n  } else if (evt.deltaMode === MOUSE_DOM_DELTA_LINE_MODE) {\n    delta /= MOUSE_LINES_PER_PAGE;\n  }\n  return delta;\n}\n\nfunction isValidRotation(angle) {\n  return Number.isInteger(angle) && angle % 90 === 0;\n}\n\nfunction isValidScrollMode(mode) {\n  return (Number.isInteger(mode) && Object.values(ScrollMode).includes(mode) &&\n          mode !== ScrollMode.UNKNOWN);\n}\n\nfunction isValidSpreadMode(mode) {\n  return (Number.isInteger(mode) && Object.values(SpreadMode).includes(mode) &&\n          mode !== SpreadMode.UNKNOWN);\n}\n\nfunction isPortraitOrientation(size) {\n  return size.width <= size.height;\n}\n\nconst WaitOnType = {\n  EVENT: 'event',\n  TIMEOUT: 'timeout',\n};\n\n/**\n * @typedef {Object} WaitOnEventOrTimeoutParameters\n * @property {Object} target - The event target, can for example be:\n *   `window`, `document`, a DOM element, or an {EventBus} instance.\n * @property {string} name - The name of the event.\n * @property {number} delay - The delay, in milliseconds, after which the\n *   timeout occurs (if the event wasn't already dispatched).\n */\n\n/**\n * Allows waiting for an event or a timeout, whichever occurs first.\n * Can be used to ensure that an action always occurs, even when an event\n * arrives late or not at all.\n *\n * @param {WaitOnEventOrTimeoutParameters}\n * @returns {Promise} A promise that is resolved with a {WaitOnType} value.\n */\nfunction waitOnEventOrTimeout({ target, name, delay = 0, }) {\n  return new Promise(function(resolve, reject) {\n    if (typeof target !== 'object' || !(name && typeof name === 'string') ||\n        !(Number.isInteger(delay) && delay >= 0)) {\n      throw new Error('waitOnEventOrTimeout - invalid parameters.');\n    }\n\n    function handler(type) {\n      if (target instanceof EventBus) {\n        target.off(name, eventHandler);\n      } else {\n        target.removeEventListener(name, eventHandler);\n      }\n\n      if (timeout) {\n        clearTimeout(timeout);\n      }\n      resolve(type);\n    }\n\n    const eventHandler = handler.bind(null, WaitOnType.EVENT);\n    if (target instanceof EventBus) {\n      target.on(name, eventHandler);\n    } else {\n      target.addEventListener(name, eventHandler);\n    }\n\n    const timeoutHandler = handler.bind(null, WaitOnType.TIMEOUT);\n    let timeout = setTimeout(timeoutHandler, delay);\n  });\n}\n\n/**\n * Promise that is resolved when DOM window becomes visible.\n */\nlet animationStarted = new Promise(function (resolve) {\n  if ((typeof PDFJSDev !== 'undefined' && PDFJSDev.test('LIB')) &&\n      typeof window === 'undefined') {\n    // Prevent \"ReferenceError: window is not defined\" errors when running the\n    // unit-tests in Node.js/Travis.\n    setTimeout(resolve, 20);\n    return;\n  }\n  window.requestAnimationFrame(resolve);\n});\n\n/**\n * Simple event bus for an application. Listeners are attached using the\n * `on` and `off` methods. To raise an event, the `dispatch` method shall be\n * used.\n */\nclass EventBus {\n  constructor({ dispatchToDOM = false, } = {}) {\n    this._listeners = Object.create(null);\n    this._dispatchToDOM = dispatchToDOM === true;\n  }\n\n  on(eventName, listener) {\n    let eventListeners = this._listeners[eventName];\n    if (!eventListeners) {\n      eventListeners = [];\n      this._listeners[eventName] = eventListeners;\n    }\n    eventListeners.push(listener);\n  }\n\n  off(eventName, listener) {\n    let eventListeners = this._listeners[eventName];\n    let i;\n    if (!eventListeners || ((i = eventListeners.indexOf(listener)) < 0)) {\n      return;\n    }\n    eventListeners.splice(i, 1);\n  }\n\n  dispatch(eventName) {\n    let eventListeners = this._listeners[eventName];\n    if (!eventListeners || eventListeners.length === 0) {\n      if (this._dispatchToDOM) {\n        const args = Array.prototype.slice.call(arguments, 1);\n        this._dispatchDOMEvent(eventName, args);\n      }\n      return;\n    }\n    // Passing all arguments after the eventName to the listeners.\n    const args = Array.prototype.slice.call(arguments, 1);\n    // Making copy of the listeners array in case if it will be modified\n    // during dispatch.\n    eventListeners.slice(0).forEach(function (listener) {\n      listener.apply(null, args);\n    });\n    if (this._dispatchToDOM) {\n      this._dispatchDOMEvent(eventName, args);\n    }\n  }\n\n  /**\n   * @private\n   */\n  _dispatchDOMEvent(eventName, args = null) {\n    const details = Object.create(null);\n    if (args && args.length > 0) {\n      const obj = args[0];\n      for (let key in obj) {\n        const value = obj[key];\n        if (key === 'source') {\n          if (value === window || value === document) {\n            return; // No need to re-dispatch (already) global events.\n          }\n          continue; // Ignore the `source` property.\n        }\n        details[key] = value;\n      }\n    }\n    const event = document.createEvent('CustomEvent');\n    event.initCustomEvent(eventName, true, true, details);\n    document.dispatchEvent(event);\n  }\n}\n\nlet globalEventBus = null;\nfunction getGlobalEventBus(dispatchToDOM = false) {\n  if (!globalEventBus) {\n    globalEventBus = new EventBus({ dispatchToDOM, });\n  }\n  return globalEventBus;\n}\n\nfunction clamp(v, min, max) {\n  return Math.min(Math.max(v, min), max);\n}\n\nclass ProgressBar {\n  constructor(id, { height, width, units, } = {}) {\n    this.visible = true;\n\n    // Fetch the sub-elements for later.\n    this.div = document.querySelector(id + ' .progress');\n    // Get the loading bar element, so it can be resized to fit the viewer.\n    this.bar = this.div.parentNode;\n\n    // Get options, with sensible defaults.\n    this.height = height || 100;\n    this.width = width || 100;\n    this.units = units || '%';\n\n    // Initialize heights.\n    this.div.style.height = this.height + this.units;\n    this.percent = 0;\n  }\n\n  _updateBar() {\n    if (this._indeterminate) {\n      this.div.classList.add('indeterminate');\n      this.div.style.width = this.width + this.units;\n      return;\n    }\n\n    this.div.classList.remove('indeterminate');\n    let progressSize = this.width * this._percent / 100;\n    this.div.style.width = progressSize + this.units;\n  }\n\n  get percent() {\n    return this._percent;\n  }\n\n  set percent(val) {\n    this._indeterminate = isNaN(val);\n    this._percent = clamp(val, 0, 100);\n    this._updateBar();\n  }\n\n  setWidth(viewer) {\n    if (!viewer) {\n      return;\n    }\n    let container = viewer.parentNode;\n    let scrollbarWidth = container.offsetWidth - viewer.offsetWidth;\n    if (scrollbarWidth > 0) {\n      this.bar.setAttribute('style', 'width: calc(100% - ' +\n                                     scrollbarWidth + 'px);');\n    }\n  }\n\n  hide() {\n    if (!this.visible) {\n      return;\n    }\n    this.visible = false;\n    this.bar.classList.add('hidden');\n    document.body.classList.remove('loadingInProgress');\n  }\n\n  show() {\n    if (this.visible) {\n      return;\n    }\n    this.visible = true;\n    document.body.classList.add('loadingInProgress');\n    this.bar.classList.remove('hidden');\n  }\n}\n\n/**\n * Moves all elements of an array that satisfy condition to the end of the\n * array, preserving the order of the rest.\n */\nfunction moveToEndOfArray(arr, condition) {\n  const moved = [], len = arr.length;\n  let write = 0;\n  for (let read = 0; read < len; ++read) {\n    if (condition(arr[read])) {\n      moved.push(arr[read]);\n    } else {\n      arr[write] = arr[read];\n      ++write;\n    }\n  }\n  for (let read = 0; write < len; ++read, ++write) {\n    arr[write] = moved[read];\n  }\n}\n\nexport {\n  CSS_UNITS,\n  DEFAULT_SCALE_VALUE,\n  DEFAULT_SCALE,\n  MIN_SCALE,\n  MAX_SCALE,\n  UNKNOWN_SCALE,\n  MAX_AUTO_SCALE,\n  SCROLLBAR_PADDING,\n  VERTICAL_PADDING,\n  isValidRotation,\n  isValidScrollMode,\n  isValidSpreadMode,\n  isPortraitOrientation,\n  PresentationModeState,\n  RendererType,\n  TextLayerMode,\n  ScrollMode,\n  SpreadMode,\n  NullL10n,\n  EventBus,\n  getGlobalEventBus,\n  ProgressBar,\n  getPDFFileNameFromURL,\n  noContextMenuHandler,\n  parseQueryString,\n  backtrackBeforeAllVisibleElements, // only exported for testing\n  getVisibleElements,\n  roundToDivide,\n  getPageSizeInches,\n  approximateFraction,\n  getOutputScale,\n  scrollIntoView,\n  watchScroll,\n  binarySearchFirstItem,\n  normalizeWheelEventDelta,\n  animationStarted,\n  WaitOnType,\n  waitOnEventOrTimeout,\n  moveToEndOfArray,\n};\n","module.exports = require(\"regenerator-runtime\");\n","/**\n * Copyright (c) 2014-present, Facebook, Inc.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n */\n\nvar runtime = (function (exports) {\n  \"use strict\";\n\n  var Op = Object.prototype;\n  var hasOwn = Op.hasOwnProperty;\n  var undefined; // More compressible than void 0.\n  var $Symbol = typeof Symbol === \"function\" ? Symbol : {};\n  var iteratorSymbol = $Symbol.iterator || \"@@iterator\";\n  var asyncIteratorSymbol = $Symbol.asyncIterator || \"@@asyncIterator\";\n  var toStringTagSymbol = $Symbol.toStringTag || \"@@toStringTag\";\n\n  function wrap(innerFn, outerFn, self, tryLocsList) {\n    // If outerFn provided and outerFn.prototype is a Generator, then outerFn.prototype instanceof Generator.\n    var protoGenerator = outerFn && outerFn.prototype instanceof Generator ? outerFn : Generator;\n    var generator = Object.create(protoGenerator.prototype);\n    var context = new Context(tryLocsList || []);\n\n    // The ._invoke method unifies the implementations of the .next,\n    // .throw, and .return methods.\n    generator._invoke = makeInvokeMethod(innerFn, self, context);\n\n    return generator;\n  }\n  exports.wrap = wrap;\n\n  // Try/catch helper to minimize deoptimizations. Returns a completion\n  // record like context.tryEntries[i].completion. This interface could\n  // have been (and was previously) designed to take a closure to be\n  // invoked without arguments, but in all the cases we care about we\n  // already have an existing method we want to call, so there's no need\n  // to create a new function object. We can even get away with assuming\n  // the method takes exactly one argument, since that happens to be true\n  // in every case, so we don't have to touch the arguments object. The\n  // only additional allocation required is the completion record, which\n  // has a stable shape and so hopefully should be cheap to allocate.\n  function tryCatch(fn, obj, arg) {\n    try {\n      return { type: \"normal\", arg: fn.call(obj, arg) };\n    } catch (err) {\n      return { type: \"throw\", arg: err };\n    }\n  }\n\n  var GenStateSuspendedStart = \"suspendedStart\";\n  var GenStateSuspendedYield = \"suspendedYield\";\n  var GenStateExecuting = \"executing\";\n  var GenStateCompleted = \"completed\";\n\n  // Returning this object from the innerFn has the same effect as\n  // breaking out of the dispatch switch statement.\n  var ContinueSentinel = {};\n\n  // Dummy constructor functions that we use as the .constructor and\n  // .constructor.prototype properties for functions that return Generator\n  // objects. For full spec compliance, you may wish to configure your\n  // minifier not to mangle the names of these two functions.\n  function Generator() {}\n  function GeneratorFunction() {}\n  function GeneratorFunctionPrototype() {}\n\n  // This is a polyfill for %IteratorPrototype% for environments that\n  // don't natively support it.\n  var IteratorPrototype = {};\n  IteratorPrototype[iteratorSymbol] = function () {\n    return this;\n  };\n\n  var getProto = Object.getPrototypeOf;\n  var NativeIteratorPrototype = getProto && getProto(getProto(values([])));\n  if (NativeIteratorPrototype &&\n      NativeIteratorPrototype !== Op &&\n      hasOwn.call(NativeIteratorPrototype, iteratorSymbol)) {\n    // This environment has a native %IteratorPrototype%; use it instead\n    // of the polyfill.\n    IteratorPrototype = NativeIteratorPrototype;\n  }\n\n  var Gp = GeneratorFunctionPrototype.prototype =\n    Generator.prototype = Object.create(IteratorPrototype);\n  GeneratorFunction.prototype = Gp.constructor = GeneratorFunctionPrototype;\n  GeneratorFunctionPrototype.constructor = GeneratorFunction;\n  GeneratorFunctionPrototype[toStringTagSymbol] =\n    GeneratorFunction.displayName = \"GeneratorFunction\";\n\n  // Helper for defining the .next, .throw, and .return methods of the\n  // Iterator interface in terms of a single ._invoke method.\n  function defineIteratorMethods(prototype) {\n    [\"next\", \"throw\", \"return\"].forEach(function(method) {\n      prototype[method] = function(arg) {\n        return this._invoke(method, arg);\n      };\n    });\n  }\n\n  exports.isGeneratorFunction = function(genFun) {\n    var ctor = typeof genFun === \"function\" && genFun.constructor;\n    return ctor\n      ? ctor === GeneratorFunction ||\n        // For the native GeneratorFunction constructor, the best we can\n        // do is to check its .name property.\n        (ctor.displayName || ctor.name) === \"GeneratorFunction\"\n      : false;\n  };\n\n  exports.mark = function(genFun) {\n    if (Object.setPrototypeOf) {\n      Object.setPrototypeOf(genFun, GeneratorFunctionPrototype);\n    } else {\n      genFun.__proto__ = GeneratorFunctionPrototype;\n      if (!(toStringTagSymbol in genFun)) {\n        genFun[toStringTagSymbol] = \"GeneratorFunction\";\n      }\n    }\n    genFun.prototype = Object.create(Gp);\n    return genFun;\n  };\n\n  // Within the body of any async function, `await x` is transformed to\n  // `yield regeneratorRuntime.awrap(x)`, so that the runtime can test\n  // `hasOwn.call(value, \"__await\")` to determine if the yielded value is\n  // meant to be awaited.\n  exports.awrap = function(arg) {\n    return { __await: arg };\n  };\n\n  function AsyncIterator(generator) {\n    function invoke(method, arg, resolve, reject) {\n      var record = tryCatch(generator[method], generator, arg);\n      if (record.type === \"throw\") {\n        reject(record.arg);\n      } else {\n        var result = record.arg;\n        var value = result.value;\n        if (value &&\n            typeof value === \"object\" &&\n            hasOwn.call(value, \"__await\")) {\n          return Promise.resolve(value.__await).then(function(value) {\n            invoke(\"next\", value, resolve, reject);\n          }, function(err) {\n            invoke(\"throw\", err, resolve, reject);\n          });\n        }\n\n        return Promise.resolve(value).then(function(unwrapped) {\n          // When a yielded Promise is resolved, its final value becomes\n          // the .value of the Promise<{value,done}> result for the\n          // current iteration.\n          result.value = unwrapped;\n          resolve(result);\n        }, function(error) {\n          // If a rejected Promise was yielded, throw the rejection back\n          // into the async generator function so it can be handled there.\n          return invoke(\"throw\", error, resolve, reject);\n        });\n      }\n    }\n\n    var previousPromise;\n\n    function enqueue(method, arg) {\n      function callInvokeWithMethodAndArg() {\n        return new Promise(function(resolve, reject) {\n          invoke(method, arg, resolve, reject);\n        });\n      }\n\n      return previousPromise =\n        // If enqueue has been called before, then we want to wait until\n        // all previous Promises have been resolved before calling invoke,\n        // so that results are always delivered in the correct order. If\n        // enqueue has not been called before, then it is important to\n        // call invoke immediately, without waiting on a callback to fire,\n        // so that the async generator function has the opportunity to do\n        // any necessary setup in a predictable way. This predictability\n        // is why the Promise constructor synchronously invokes its\n        // executor callback, and why async functions synchronously\n        // execute code before the first await. Since we implement simple\n        // async functions in terms of async generators, it is especially\n        // important to get this right, even though it requires care.\n        previousPromise ? previousPromise.then(\n          callInvokeWithMethodAndArg,\n          // Avoid propagating failures to Promises returned by later\n          // invocations of the iterator.\n          callInvokeWithMethodAndArg\n        ) : callInvokeWithMethodAndArg();\n    }\n\n    // Define the unified helper method that is used to implement .next,\n    // .throw, and .return (see defineIteratorMethods).\n    this._invoke = enqueue;\n  }\n\n  defineIteratorMethods(AsyncIterator.prototype);\n  AsyncIterator.prototype[asyncIteratorSymbol] = function () {\n    return this;\n  };\n  exports.AsyncIterator = AsyncIterator;\n\n  // Note that simple async functions are implemented on top of\n  // AsyncIterator objects; they just return a Promise for the value of\n  // the final result produced by the iterator.\n  exports.async = function(innerFn, outerFn, self, tryLocsList) {\n    var iter = new AsyncIterator(\n      wrap(innerFn, outerFn, self, tryLocsList)\n    );\n\n    return exports.isGeneratorFunction(outerFn)\n      ? iter // If outerFn is a generator, return the full iterator.\n      : iter.next().then(function(result) {\n          return result.done ? result.value : iter.next();\n        });\n  };\n\n  function makeInvokeMethod(innerFn, self, context) {\n    var state = GenStateSuspendedStart;\n\n    return function invoke(method, arg) {\n      if (state === GenStateExecuting) {\n        throw new Error(\"Generator is already running\");\n      }\n\n      if (state === GenStateCompleted) {\n        if (method === \"throw\") {\n          throw arg;\n        }\n\n        // Be forgiving, per 25.3.3.3.3 of the spec:\n        // https://people.mozilla.org/~jorendorff/es6-draft.html#sec-generatorresume\n        return doneResult();\n      }\n\n      context.method = method;\n      context.arg = arg;\n\n      while (true) {\n        var delegate = context.delegate;\n        if (delegate) {\n          var delegateResult = maybeInvokeDelegate(delegate, context);\n          if (delegateResult) {\n            if (delegateResult === ContinueSentinel) continue;\n            return delegateResult;\n          }\n        }\n\n        if (context.method === \"next\") {\n          // Setting context._sent for legacy support of Babel's\n          // function.sent implementation.\n          context.sent = context._sent = context.arg;\n\n        } else if (context.method === \"throw\") {\n          if (state === GenStateSuspendedStart) {\n            state = GenStateCompleted;\n            throw context.arg;\n          }\n\n          context.dispatchException(context.arg);\n\n        } else if (context.method === \"return\") {\n          context.abrupt(\"return\", context.arg);\n        }\n\n        state = GenStateExecuting;\n\n        var record = tryCatch(innerFn, self, context);\n        if (record.type === \"normal\") {\n          // If an exception is thrown from innerFn, we leave state ===\n          // GenStateExecuting and loop back for another invocation.\n          state = context.done\n            ? GenStateCompleted\n            : GenStateSuspendedYield;\n\n          if (record.arg === ContinueSentinel) {\n            continue;\n          }\n\n          return {\n            value: record.arg,\n            done: context.done\n          };\n\n        } else if (record.type === \"throw\") {\n          state = GenStateCompleted;\n          // Dispatch the exception by looping back around to the\n          // context.dispatchException(context.arg) call above.\n          context.method = \"throw\";\n          context.arg = record.arg;\n        }\n      }\n    };\n  }\n\n  // Call delegate.iterator[context.method](context.arg) and handle the\n  // result, either by returning a { value, done } result from the\n  // delegate iterator, or by modifying context.method and context.arg,\n  // setting context.delegate to null, and returning the ContinueSentinel.\n  function maybeInvokeDelegate(delegate, context) {\n    var method = delegate.iterator[context.method];\n    if (method === undefined) {\n      // A .throw or .return when the delegate iterator has no .throw\n      // method always terminates the yield* loop.\n      context.delegate = null;\n\n      if (context.method === \"throw\") {\n        // Note: [\"return\"] must be used for ES3 parsing compatibility.\n        if (delegate.iterator[\"return\"]) {\n          // If the delegate iterator has a return method, give it a\n          // chance to clean up.\n          context.method = \"return\";\n          context.arg = undefined;\n          maybeInvokeDelegate(delegate, context);\n\n          if (context.method === \"throw\") {\n            // If maybeInvokeDelegate(context) changed context.method from\n            // \"return\" to \"throw\", let that override the TypeError below.\n            return ContinueSentinel;\n          }\n        }\n\n        context.method = \"throw\";\n        context.arg = new TypeError(\n          \"The iterator does not provide a 'throw' method\");\n      }\n\n      return ContinueSentinel;\n    }\n\n    var record = tryCatch(method, delegate.iterator, context.arg);\n\n    if (record.type === \"throw\") {\n      context.method = \"throw\";\n      context.arg = record.arg;\n      context.delegate = null;\n      return ContinueSentinel;\n    }\n\n    var info = record.arg;\n\n    if (! info) {\n      context.method = \"throw\";\n      context.arg = new TypeError(\"iterator result is not an object\");\n      context.delegate = null;\n      return ContinueSentinel;\n    }\n\n    if (info.done) {\n      // Assign the result of the finished delegate to the temporary\n      // variable specified by delegate.resultName (see delegateYield).\n      context[delegate.resultName] = info.value;\n\n      // Resume execution at the desired location (see delegateYield).\n      context.next = delegate.nextLoc;\n\n      // If context.method was \"throw\" but the delegate handled the\n      // exception, let the outer generator proceed normally. If\n      // context.method was \"next\", forget context.arg since it has been\n      // \"consumed\" by the delegate iterator. If context.method was\n      // \"return\", allow the original .return call to continue in the\n      // outer generator.\n      if (context.method !== \"return\") {\n        context.method = \"next\";\n        context.arg = undefined;\n      }\n\n    } else {\n      // Re-yield the result returned by the delegate method.\n      return info;\n    }\n\n    // The delegate iterator is finished, so forget it and continue with\n    // the outer generator.\n    context.delegate = null;\n    return ContinueSentinel;\n  }\n\n  // Define Generator.prototype.{next,throw,return} in terms of the\n  // unified ._invoke helper method.\n  defineIteratorMethods(Gp);\n\n  Gp[toStringTagSymbol] = \"Generator\";\n\n  // A Generator should always return itself as the iterator object when the\n  // @@iterator function is called on it. Some browsers' implementations of the\n  // iterator prototype chain incorrectly implement this, causing the Generator\n  // object to not be returned from this call. This ensures that doesn't happen.\n  // See https://github.com/facebook/regenerator/issues/274 for more details.\n  Gp[iteratorSymbol] = function() {\n    return this;\n  };\n\n  Gp.toString = function() {\n    return \"[object Generator]\";\n  };\n\n  function pushTryEntry(locs) {\n    var entry = { tryLoc: locs[0] };\n\n    if (1 in locs) {\n      entry.catchLoc = locs[1];\n    }\n\n    if (2 in locs) {\n      entry.finallyLoc = locs[2];\n      entry.afterLoc = locs[3];\n    }\n\n    this.tryEntries.push(entry);\n  }\n\n  function resetTryEntry(entry) {\n    var record = entry.completion || {};\n    record.type = \"normal\";\n    delete record.arg;\n    entry.completion = record;\n  }\n\n  function Context(tryLocsList) {\n    // The root entry object (effectively a try statement without a catch\n    // or a finally block) gives us a place to store values thrown from\n    // locations where there is no enclosing try statement.\n    this.tryEntries = [{ tryLoc: \"root\" }];\n    tryLocsList.forEach(pushTryEntry, this);\n    this.reset(true);\n  }\n\n  exports.keys = function(object) {\n    var keys = [];\n    for (var key in object) {\n      keys.push(key);\n    }\n    keys.reverse();\n\n    // Rather than returning an object with a next method, we keep\n    // things simple and return the next function itself.\n    return function next() {\n      while (keys.length) {\n        var key = keys.pop();\n        if (key in object) {\n          next.value = key;\n          next.done = false;\n          return next;\n        }\n      }\n\n      // To avoid creating an additional object, we just hang the .value\n      // and .done properties off the next function object itself. This\n      // also ensures that the minifier will not anonymize the function.\n      next.done = true;\n      return next;\n    };\n  };\n\n  function values(iterable) {\n    if (iterable) {\n      var iteratorMethod = iterable[iteratorSymbol];\n      if (iteratorMethod) {\n        return iteratorMethod.call(iterable);\n      }\n\n      if (typeof iterable.next === \"function\") {\n        return iterable;\n      }\n\n      if (!isNaN(iterable.length)) {\n        var i = -1, next = function next() {\n          while (++i < iterable.length) {\n            if (hasOwn.call(iterable, i)) {\n              next.value = iterable[i];\n              next.done = false;\n              return next;\n            }\n          }\n\n          next.value = undefined;\n          next.done = true;\n\n          return next;\n        };\n\n        return next.next = next;\n      }\n    }\n\n    // Return an iterator with no values.\n    return { next: doneResult };\n  }\n  exports.values = values;\n\n  function doneResult() {\n    return { value: undefined, done: true };\n  }\n\n  Context.prototype = {\n    constructor: Context,\n\n    reset: function(skipTempReset) {\n      this.prev = 0;\n      this.next = 0;\n      // Resetting context._sent for legacy support of Babel's\n      // function.sent implementation.\n      this.sent = this._sent = undefined;\n      this.done = false;\n      this.delegate = null;\n\n      this.method = \"next\";\n      this.arg = undefined;\n\n      this.tryEntries.forEach(resetTryEntry);\n\n      if (!skipTempReset) {\n        for (var name in this) {\n          // Not sure about the optimal order of these conditions:\n          if (name.charAt(0) === \"t\" &&\n              hasOwn.call(this, name) &&\n              !isNaN(+name.slice(1))) {\n            this[name] = undefined;\n          }\n        }\n      }\n    },\n\n    stop: function() {\n      this.done = true;\n\n      var rootEntry = this.tryEntries[0];\n      var rootRecord = rootEntry.completion;\n      if (rootRecord.type === \"throw\") {\n        throw rootRecord.arg;\n      }\n\n      return this.rval;\n    },\n\n    dispatchException: function(exception) {\n      if (this.done) {\n        throw exception;\n      }\n\n      var context = this;\n      function handle(loc, caught) {\n        record.type = \"throw\";\n        record.arg = exception;\n        context.next = loc;\n\n        if (caught) {\n          // If the dispatched exception was caught by a catch block,\n          // then let that catch block handle the exception normally.\n          context.method = \"next\";\n          context.arg = undefined;\n        }\n\n        return !! caught;\n      }\n\n      for (var i = this.tryEntries.length - 1; i >= 0; --i) {\n        var entry = this.tryEntries[i];\n        var record = entry.completion;\n\n        if (entry.tryLoc === \"root\") {\n          // Exception thrown outside of any try block that could handle\n          // it, so set the completion value of the entire function to\n          // throw the exception.\n          return handle(\"end\");\n        }\n\n        if (entry.tryLoc <= this.prev) {\n          var hasCatch = hasOwn.call(entry, \"catchLoc\");\n          var hasFinally = hasOwn.call(entry, \"finallyLoc\");\n\n          if (hasCatch && hasFinally) {\n            if (this.prev < entry.catchLoc) {\n              return handle(entry.catchLoc, true);\n            } else if (this.prev < entry.finallyLoc) {\n              return handle(entry.finallyLoc);\n            }\n\n          } else if (hasCatch) {\n            if (this.prev < entry.catchLoc) {\n              return handle(entry.catchLoc, true);\n            }\n\n          } else if (hasFinally) {\n            if (this.prev < entry.finallyLoc) {\n              return handle(entry.finallyLoc);\n            }\n\n          } else {\n            throw new Error(\"try statement without catch or finally\");\n          }\n        }\n      }\n    },\n\n    abrupt: function(type, arg) {\n      for (var i = this.tryEntries.length - 1; i >= 0; --i) {\n        var entry = this.tryEntries[i];\n        if (entry.tryLoc <= this.prev &&\n            hasOwn.call(entry, \"finallyLoc\") &&\n            this.prev < entry.finallyLoc) {\n          var finallyEntry = entry;\n          break;\n        }\n      }\n\n      if (finallyEntry &&\n          (type === \"break\" ||\n           type === \"continue\") &&\n          finallyEntry.tryLoc <= arg &&\n          arg <= finallyEntry.finallyLoc) {\n        // Ignore the finally entry if control is not jumping to a\n        // location outside the try/catch block.\n        finallyEntry = null;\n      }\n\n      var record = finallyEntry ? finallyEntry.completion : {};\n      record.type = type;\n      record.arg = arg;\n\n      if (finallyEntry) {\n        this.method = \"next\";\n        this.next = finallyEntry.finallyLoc;\n        return ContinueSentinel;\n      }\n\n      return this.complete(record);\n    },\n\n    complete: function(record, afterLoc) {\n      if (record.type === \"throw\") {\n        throw record.arg;\n      }\n\n      if (record.type === \"break\" ||\n          record.type === \"continue\") {\n        this.next = record.arg;\n      } else if (record.type === \"return\") {\n        this.rval = this.arg = record.arg;\n        this.method = \"return\";\n        this.next = \"end\";\n      } else if (record.type === \"normal\" && afterLoc) {\n        this.next = afterLoc;\n      }\n\n      return ContinueSentinel;\n    },\n\n    finish: function(finallyLoc) {\n      for (var i = this.tryEntries.length - 1; i >= 0; --i) {\n        var entry = this.tryEntries[i];\n        if (entry.finallyLoc === finallyLoc) {\n          this.complete(entry.completion, entry.afterLoc);\n          resetTryEntry(entry);\n          return ContinueSentinel;\n        }\n      }\n    },\n\n    \"catch\": function(tryLoc) {\n      for (var i = this.tryEntries.length - 1; i >= 0; --i) {\n        var entry = this.tryEntries[i];\n        if (entry.tryLoc === tryLoc) {\n          var record = entry.completion;\n          if (record.type === \"throw\") {\n            var thrown = record.arg;\n            resetTryEntry(entry);\n          }\n          return thrown;\n        }\n      }\n\n      // The context.catch method must only be called with a location\n      // argument that corresponds to a known catch block.\n      throw new Error(\"illegal catch attempt\");\n    },\n\n    delegateYield: function(iterable, resultName, nextLoc) {\n      this.delegate = {\n        iterator: values(iterable),\n        resultName: resultName,\n        nextLoc: nextLoc\n      };\n\n      if (this.method === \"next\") {\n        // Deliberately forget the last sent value so that we don't\n        // accidentally pass it on to the delegate.\n        this.arg = undefined;\n      }\n\n      return ContinueSentinel;\n    }\n  };\n\n  // Regardless of whether this script is executing as a CommonJS module\n  // or not, return the runtime object so that we can declare the variable\n  // regeneratorRuntime in the outer scope, which allows this module to be\n  // injected easily by `bin/regenerator --include-runtime script.js`.\n  return exports;\n\n}(\n  // If this script is executing as a CommonJS module, use module.exports\n  // as the regeneratorRuntime namespace. Otherwise create a new empty\n  // object. Either way, the resulting object will be used to initialize\n  // the regeneratorRuntime variable at the top of this file.\n  typeof module === \"object\" ? module.exports : {}\n));\n\ntry {\n  regeneratorRuntime = runtime;\n} catch (accidentalStrictMode) {\n  // This module should not be running in strict mode, so the above\n  // assignment should always work unless something is misconfigured. Just\n  // in case runtime.js accidentally runs in strict mode, we can escape\n  // strict mode using a global Function call. This could conceivably fail\n  // if a Content Security Policy forbids using Function, but in that case\n  // the proper solution is to fix the accidental strict mode problem. If\n  // you've misconfigured your bundler to force strict mode and applied a\n  // CSP to forbid Function, and you're not willing to fix either of those\n  // problems, please detail your unique predicament in a GitHub issue.\n  Function(\"r\", \"regeneratorRuntime = r\")(runtime);\n}\n","module.exports = function(module) {\n\tif (!module.webpackPolyfill) {\n\t\tmodule.deprecate = function() {};\n\t\tmodule.paths = [];\n\t\t// module.parent = undefined by default\n\t\tif (!module.children) module.children = [];\n\t\tObject.defineProperty(module, \"loaded\", {\n\t\t\tenumerable: true,\n\t\t\tget: function() {\n\t\t\t\treturn module.l;\n\t\t\t}\n\t\t});\n\t\tObject.defineProperty(module, \"id\", {\n\t\t\tenumerable: true,\n\t\t\tget: function() {\n\t\t\t\treturn module.i;\n\t\t\t}\n\t\t});\n\t\tmodule.webpackPolyfill = 1;\n\t}\n\treturn module;\n};\n","/* Copyright 2015 Mozilla Foundation\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *     http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { getGlobalEventBus, parseQueryString } from './ui_utils';\n\n/**\n * @typedef {Object} PDFLinkServiceOptions\n * @property {EventBus} eventBus - The application event bus.\n * @property {number} externalLinkTarget - (optional) Specifies the `target`\n *   attribute for external links. Must use one of the values from {LinkTarget}.\n *   Defaults to using no target.\n * @property {string} externalLinkRel - (optional) Specifies the `rel` attribute\n *   for external links. Defaults to stripping the referrer.\n */\n\n/**\n * Performs navigation functions inside PDF, such as opening specified page,\n * or destination.\n * @implements {IPDFLinkService}\n */\nclass PDFLinkService {\n  /**\n   * @param {PDFLinkServiceOptions} options\n   */\n  constructor({ eventBus, externalLinkTarget = null,\n                externalLinkRel = null, } = {}) {\n    this.eventBus = eventBus || getGlobalEventBus();\n    this.externalLinkTarget = externalLinkTarget;\n    this.externalLinkRel = externalLinkRel;\n\n    this.baseUrl = null;\n    this.pdfDocument = null;\n    this.pdfViewer = null;\n    this.pdfHistory = null;\n\n    this._pagesRefCache = null;\n  }\n\n  setDocument(pdfDocument, baseUrl = null) {\n    this.baseUrl = baseUrl;\n    this.pdfDocument = pdfDocument;\n    this._pagesRefCache = Object.create(null);\n  }\n\n  setViewer(pdfViewer) {\n    this.pdfViewer = pdfViewer;\n  }\n\n  setHistory(pdfHistory) {\n    this.pdfHistory = pdfHistory;\n  }\n\n  /**\n   * @returns {number}\n   */\n  get pagesCount() {\n    return this.pdfDocument ? this.pdfDocument.numPages : 0;\n  }\n\n  /**\n   * @returns {number}\n   */\n  get page() {\n    return this.pdfViewer.currentPageNumber;\n  }\n\n  /**\n   * @param {number} value\n   */\n  set page(value) {\n    this.pdfViewer.currentPageNumber = value;\n  }\n\n  /**\n   * @returns {number}\n   */\n  get rotation() {\n    return this.pdfViewer.pagesRotation;\n  }\n\n  /**\n   * @param {number} value\n   */\n  set rotation(value) {\n    this.pdfViewer.pagesRotation = value;\n  }\n\n  /**\n   * @param {string|Array} dest - The named, or explicit, PDF destination.\n   */\n  navigateTo(dest) {\n    let goToDestination = ({ namedDest, explicitDest, }) => {\n      // Dest array looks like that: <page-ref> </XYZ|/FitXXX> <args..>\n      let destRef = explicitDest[0], pageNumber;\n\n      if (destRef instanceof Object) {\n        pageNumber = this._cachedPageNumber(destRef);\n\n        if (pageNumber === null) {\n          // Fetch the page reference if it's not yet available. This could\n          // only occur during loading, before all pages have been resolved.\n          this.pdfDocument.getPageIndex(destRef).then((pageIndex) => {\n            this.cachePageRef(pageIndex + 1, destRef);\n            goToDestination({ namedDest, explicitDest, });\n          }).catch(() => {\n            console.error(`PDFLinkService.navigateTo: \"${destRef}\" is not ` +\n                          `a valid page reference, for dest=\"${dest}\".`);\n          });\n          return;\n        }\n      } else if (Number.isInteger(destRef)) {\n        pageNumber = destRef + 1;\n      } else {\n        console.error(`PDFLinkService.navigateTo: \"${destRef}\" is not ` +\n                      `a valid destination reference, for dest=\"${dest}\".`);\n        return;\n      }\n      if (!pageNumber || pageNumber < 1 || pageNumber > this.pagesCount) {\n        console.error(`PDFLinkService.navigateTo: \"${pageNumber}\" is not ` +\n                      `a valid page number, for dest=\"${dest}\".`);\n        return;\n      }\n\n      if (this.pdfHistory) {\n        // Update the browser history before scrolling the new destination into\n        // view, to be able to accurately capture the current document position.\n        this.pdfHistory.pushCurrentPosition();\n        this.pdfHistory.push({ namedDest, explicitDest, pageNumber, });\n      }\n\n      this.pdfViewer.scrollPageIntoView({\n        pageNumber,\n        destArray: explicitDest,\n      });\n    };\n\n    new Promise((resolve, reject) => {\n      if (typeof dest === 'string') {\n        this.pdfDocument.getDestination(dest).then((destArray) => {\n          resolve({\n            namedDest: dest,\n            explicitDest: destArray,\n          });\n        });\n        return;\n      }\n      resolve({\n        namedDest: '',\n        explicitDest: dest,\n      });\n    }).then((data) => {\n      if (!Array.isArray(data.explicitDest)) {\n        console.error(`PDFLinkService.navigateTo: \"${data.explicitDest}\" is` +\n                      ` not a valid destination array, for dest=\"${dest}\".`);\n        return;\n      }\n      goToDestination(data);\n    });\n  }\n\n  /**\n   * @param {string|Array} dest - The PDF destination object.\n   * @returns {string} The hyperlink to the PDF object.\n   */\n  getDestinationHash(dest) {\n    if (typeof dest === 'string') {\n      return this.getAnchorUrl('#' + escape(dest));\n    }\n    if (Array.isArray(dest)) {\n      let str = JSON.stringify(dest);\n      return this.getAnchorUrl('#' + escape(str));\n    }\n    return this.getAnchorUrl('');\n  }\n\n  /**\n   * Prefix the full url on anchor links to make sure that links are resolved\n   * relative to the current URL instead of the one defined in <base href>.\n   * @param {String} anchor The anchor hash, including the #.\n   * @returns {string} The hyperlink to the PDF object.\n   */\n  getAnchorUrl(anchor) {\n    return (this.baseUrl || '') + anchor;\n  }\n\n  /**\n   * @param {string} hash\n   */\n  setHash(hash) {\n    let pageNumber, dest;\n    if (hash.includes('=')) {\n      let params = parseQueryString(hash);\n      if ('search' in params) {\n        this.eventBus.dispatch('findfromurlhash', {\n          source: this,\n          query: params['search'].replace(/\"/g, ''),\n          phraseSearch: (params['phrase'] === 'true'),\n        });\n      }\n      // borrowing syntax from \"Parameters for Opening PDF Files\"\n      if ('nameddest' in params) {\n        this.navigateTo(params.nameddest);\n        return;\n      }\n      if ('page' in params) {\n        pageNumber = (params.page | 0) || 1;\n      }\n      if ('zoom' in params) {\n        // Build the destination array.\n        let zoomArgs = params.zoom.split(','); // scale,left,top\n        let zoomArg = zoomArgs[0];\n        let zoomArgNumber = parseFloat(zoomArg);\n\n        if (!zoomArg.includes('Fit')) {\n          // If the zoomArg is a number, it has to get divided by 100. If it's\n          // a string, it should stay as it is.\n          dest = [null, { name: 'XYZ', },\n                  zoomArgs.length > 1 ? (zoomArgs[1] | 0) : null,\n                  zoomArgs.length > 2 ? (zoomArgs[2] | 0) : null,\n                  (zoomArgNumber ? zoomArgNumber / 100 : zoomArg)];\n        } else {\n          if (zoomArg === 'Fit' || zoomArg === 'FitB') {\n            dest = [null, { name: zoomArg, }];\n          } else if ((zoomArg === 'FitH' || zoomArg === 'FitBH') ||\n                     (zoomArg === 'FitV' || zoomArg === 'FitBV')) {\n            dest = [null, { name: zoomArg, },\n                    zoomArgs.length > 1 ? (zoomArgs[1] | 0) : null];\n          } else if (zoomArg === 'FitR') {\n            if (zoomArgs.length !== 5) {\n              console.error(\n                'PDFLinkService.setHash: Not enough parameters for \"FitR\".');\n            } else {\n              dest = [null, { name: zoomArg, },\n                      (zoomArgs[1] | 0), (zoomArgs[2] | 0),\n                      (zoomArgs[3] | 0), (zoomArgs[4] | 0)];\n            }\n          } else {\n            console.error(`PDFLinkService.setHash: \"${zoomArg}\" is not ` +\n                          'a valid zoom value.');\n          }\n        }\n      }\n      if (dest) {\n        this.pdfViewer.scrollPageIntoView({\n          pageNumber: pageNumber || this.page,\n          destArray: dest,\n          allowNegativeOffset: true,\n        });\n      } else if (pageNumber) {\n        this.page = pageNumber; // simple page\n      }\n      if ('pagemode' in params) {\n        this.eventBus.dispatch('pagemode', {\n          source: this,\n          mode: params.pagemode,\n        });\n      }\n    } else { // Named (or explicit) destination.\n      dest = unescape(hash);\n      try {\n        dest = JSON.parse(dest);\n\n        if (!Array.isArray(dest)) {\n          // Avoid incorrectly rejecting a valid named destination, such as\n          // e.g. \"4.3\" or \"true\", because `JSON.parse` converted its type.\n          dest = dest.toString();\n        }\n      } catch (ex) {}\n\n      if (typeof dest === 'string' || isValidExplicitDestination(dest)) {\n        this.navigateTo(dest);\n        return;\n      }\n      console.error(`PDFLinkService.setHash: \"${unescape(hash)}\" is not ` +\n                    'a valid destination.');\n    }\n  }\n\n  /**\n   * @param {string} action\n   */\n  executeNamedAction(action) {\n    // See PDF reference, table 8.45 - Named action\n    switch (action) {\n      case 'GoBack':\n        if (this.pdfHistory) {\n          this.pdfHistory.back();\n        }\n        break;\n\n      case 'GoForward':\n        if (this.pdfHistory) {\n          this.pdfHistory.forward();\n        }\n        break;\n\n      case 'NextPage':\n        if (this.page < this.pagesCount) {\n          this.page++;\n        }\n        break;\n\n      case 'PrevPage':\n        if (this.page > 1) {\n          this.page--;\n        }\n        break;\n\n      case 'LastPage':\n        this.page = this.pagesCount;\n        break;\n\n      case 'FirstPage':\n        this.page = 1;\n        break;\n\n      default:\n        break; // No action according to spec\n    }\n\n    this.eventBus.dispatch('namedaction', {\n      source: this,\n      action,\n    });\n  }\n\n  /**\n   * @param {number} pageNum - page number.\n   * @param {Object} pageRef - reference to the page.\n   */\n  cachePageRef(pageNum, pageRef) {\n    if (!pageRef) {\n      return;\n    }\n    let refStr = pageRef.num + ' ' + pageRef.gen + ' R';\n    this._pagesRefCache[refStr] = pageNum;\n  }\n\n  _cachedPageNumber(pageRef) {\n    let refStr = pageRef.num + ' ' + pageRef.gen + ' R';\n    return (this._pagesRefCache && this._pagesRefCache[refStr]) || null;\n  }\n\n  /**\n   * @param {number} pageNumber\n   */\n  isPageVisible(pageNumber) {\n    return this.pdfViewer.isPageVisible(pageNumber);\n  }\n}\n\nfunction isValidExplicitDestination(dest) {\n  if (!Array.isArray(dest)) {\n    return false;\n  }\n  let destLength = dest.length, allowNull = true;\n  if (destLength < 2) {\n    return false;\n  }\n  let page = dest[0];\n  if (!(typeof page === 'object' &&\n        Number.isInteger(page.num) && Number.isInteger(page.gen)) &&\n      !(Number.isInteger(page) && page >= 0)) {\n    return false;\n  }\n  let zoom = dest[1];\n  if (!(typeof zoom === 'object' && typeof zoom.name === 'string')) {\n    return false;\n  }\n  switch (zoom.name) {\n    case 'XYZ':\n      if (destLength !== 5) {\n        return false;\n      }\n      break;\n    case 'Fit':\n    case 'FitB':\n      return destLength === 2;\n    case 'FitH':\n    case 'FitBH':\n    case 'FitV':\n    case 'FitBV':\n      if (destLength !== 3) {\n        return false;\n      }\n      break;\n    case 'FitR':\n      if (destLength !== 6) {\n        return false;\n      }\n      allowNull = false;\n      break;\n    default:\n      return false;\n  }\n  for (let i = 2; i < destLength; i++) {\n    let param = dest[i];\n    if (!(typeof param === 'number' || (allowNull && param === null))) {\n      return false;\n    }\n  }\n  return true;\n}\n\n/**\n * @implements {IPDFLinkService}\n */\nclass SimpleLinkService {\n  constructor() {\n    this.externalLinkTarget = null;\n    this.externalLinkRel = null;\n  }\n\n  /**\n   * @returns {number}\n   */\n  get pagesCount() {\n    return 0;\n  }\n\n  /**\n   * @returns {number}\n   */\n  get page() {\n    return 0;\n  }\n\n  /**\n   * @param {number} value\n   */\n  set page(value) {}\n\n  /**\n   * @returns {number}\n   */\n  get rotation() {\n    return 0;\n  }\n\n  /**\n   * @param {number} value\n   */\n  set rotation(value) {}\n\n  /**\n   * @param dest - The PDF destination object.\n   */\n  navigateTo(dest) {}\n\n  /**\n   * @param dest - The PDF destination object.\n   * @returns {string} The hyperlink to the PDF object.\n   */\n  getDestinationHash(dest) {\n    return '#';\n  }\n\n  /**\n   * @param hash - The PDF parameters/hash.\n   * @returns {string} The hyperlink to the PDF object.\n   */\n  getAnchorUrl(hash) {\n    return '#';\n  }\n\n  /**\n   * @param {string} hash\n   */\n  setHash(hash) {}\n\n  /**\n   * @param {string} action\n   */\n  executeNamedAction(action) {}\n\n  /**\n   * @param {number} pageNum - page number.\n   * @param {Object} pageRef - reference to the page.\n   */\n  cachePageRef(pageNum, pageRef) {}\n\n  /**\n   * @param {number} pageNumber\n   */\n  isPageVisible(pageNumber) {\n    return true;\n  }\n}\n\nexport {\n  PDFLinkService,\n  SimpleLinkService,\n};\n","/* Copyright 2012 Mozilla Foundation\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *     http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { getGlobalEventBus } from './ui_utils';\nimport { renderTextLayer } from 'pdfjs-lib';\n\nconst EXPAND_DIVS_TIMEOUT = 300; // ms\n\n/**\n * @typedef {Object} TextLayerBuilderOptions\n * @property {HTMLDivElement} textLayerDiv - The text layer container.\n * @property {EventBus} eventBus - The application event bus.\n * @property {number} pageIndex - The page index.\n * @property {PageViewport} viewport - The viewport of the text layer.\n * @property {PDFFindController} findController\n * @property {boolean} enhanceTextSelection - Option to turn on improved\n *   text selection.\n */\n\n/**\n * The text layer builder provides text selection functionality for the PDF.\n * It does this by creating overlay divs over the PDF's text. These divs\n * contain text that matches the PDF text they are overlaying. This object\n * also provides a way to highlight text that is being searched for.\n */\nclass TextLayerBuilder {\n  constructor({ textLayerDiv, eventBus, pageIndex, viewport,\n                findController = null, enhanceTextSelection = false, }) {\n    this.textLayerDiv = textLayerDiv;\n    this.eventBus = eventBus || getGlobalEventBus();\n    this.textContent = null;\n    this.textContentItemsStr = [];\n    this.textContentStream = null;\n    this.renderingDone = false;\n    this.pageIdx = pageIndex;\n    this.pageNumber = this.pageIdx + 1;\n    this.matches = [];\n    this.viewport = viewport;\n    this.textDivs = [];\n    this.findController = findController;\n    this.textLayerRenderTask = null;\n    this.enhanceTextSelection = enhanceTextSelection;\n\n    this._onUpdateTextLayerMatches = null;\n    this._bindMouse();\n  }\n\n  /**\n   * @private\n   */\n  _finishRendering() {\n    this.renderingDone = true;\n\n    if (!this.enhanceTextSelection) {\n      let endOfContent = document.createElement('div');\n      endOfContent.className = 'endOfContent';\n      this.textLayerDiv.appendChild(endOfContent);\n    }\n\n    this.eventBus.dispatch('textlayerrendered', {\n      source: this,\n      pageNumber: this.pageNumber,\n      numTextDivs: this.textDivs.length,\n    });\n  }\n\n  /**\n   * Renders the text layer.\n   *\n   * @param {number} timeout - (optional) wait for a specified amount of\n   *                           milliseconds before rendering\n   */\n  render(timeout = 0) {\n    if (!(this.textContent || this.textContentStream) || this.renderingDone) {\n      return;\n    }\n    this.cancel();\n\n    this.textDivs = [];\n    let textLayerFrag = document.createDocumentFragment();\n    this.textLayerRenderTask = renderTextLayer({\n      textContent: this.textContent,\n      textContentStream: this.textContentStream,\n      container: textLayerFrag,\n      viewport: this.viewport,\n      textDivs: this.textDivs,\n      textContentItemsStr: this.textContentItemsStr,\n      timeout,\n      enhanceTextSelection: this.enhanceTextSelection,\n    });\n    this.textLayerRenderTask.promise.then(() => {\n      this.textLayerDiv.appendChild(textLayerFrag);\n      this._finishRendering();\n      this._updateMatches();\n    }, function (reason) {\n      // Cancelled or failed to render text layer; skipping errors.\n    });\n\n    if (!this._onUpdateTextLayerMatches) {\n      this._onUpdateTextLayerMatches = (evt) => {\n        if (evt.pageIndex === this.pageIdx || evt.pageIndex === -1) {\n          this._updateMatches();\n        }\n      };\n      this.eventBus.on('updatetextlayermatches',\n                       this._onUpdateTextLayerMatches);\n    }\n  }\n\n  /**\n   * Cancel rendering of the text layer.\n   */\n  cancel() {\n    if (this.textLayerRenderTask) {\n      this.textLayerRenderTask.cancel();\n      this.textLayerRenderTask = null;\n    }\n    if (this._onUpdateTextLayerMatches) {\n      this.eventBus.off('updatetextlayermatches',\n                        this._onUpdateTextLayerMatches);\n      this._onUpdateTextLayerMatches = null;\n    }\n  }\n\n  setTextContentStream(readableStream) {\n    this.cancel();\n    this.textContentStream = readableStream;\n  }\n\n  setTextContent(textContent) {\n    this.cancel();\n    this.textContent = textContent;\n  }\n\n  _convertMatches(matches, matchesLength) {\n    // Early exit if there is nothing to convert.\n    if (!matches) {\n      return [];\n    }\n    const { findController, textContentItemsStr, } = this;\n\n    let i = 0, iIndex = 0;\n    const end = textContentItemsStr.length - 1;\n    const queryLen = findController.state.query.length;\n    const result = [];\n\n    for (let m = 0, mm = matches.length; m < mm; m++) {\n      // Calculate the start position.\n      let matchIdx = matches[m];\n\n      // Loop over the divIdxs.\n      while (i !== end &&\n             matchIdx >= (iIndex + textContentItemsStr[i].length)) {\n        iIndex += textContentItemsStr[i].length;\n        i++;\n      }\n\n      if (i === textContentItemsStr.length) {\n        console.error('Could not find a matching mapping');\n      }\n\n      let match = {\n        begin: {\n          divIdx: i,\n          offset: matchIdx - iIndex,\n        },\n      };\n\n      // Calculate the end position.\n      if (matchesLength) { // Multiterm search.\n        matchIdx += matchesLength[m];\n      } else { // Phrase search.\n        matchIdx += queryLen;\n      }\n\n      // Somewhat the same array as above, but use > instead of >= to get\n      // the end position right.\n      while (i !== end &&\n             matchIdx > (iIndex + textContentItemsStr[i].length)) {\n        iIndex += textContentItemsStr[i].length;\n        i++;\n      }\n\n      match.end = {\n        divIdx: i,\n        offset: matchIdx - iIndex,\n      };\n      result.push(match);\n    }\n    return result;\n  }\n\n  _renderMatches(matches) {\n    // Early exit if there is nothing to render.\n    if (matches.length === 0) {\n      return;\n    }\n    const { findController, pageIdx, textContentItemsStr, textDivs, } = this;\n\n    const isSelectedPage = (pageIdx === findController.selected.pageIdx);\n    const selectedMatchIdx = findController.selected.matchIdx;\n    const highlightAll = findController.state.highlightAll;\n    let prevEnd = null;\n    let infinity = {\n      divIdx: -1,\n      offset: undefined,\n    };\n\n    function beginText(begin, className) {\n      let divIdx = begin.divIdx;\n      textDivs[divIdx].textContent = '';\n      appendTextToDiv(divIdx, 0, begin.offset, className);\n    }\n\n    function appendTextToDiv(divIdx, fromOffset, toOffset, className) {\n      let div = textDivs[divIdx];\n      let content = textContentItemsStr[divIdx].substring(fromOffset, toOffset);\n      let node = document.createTextNode(content);\n      if (className) {\n        let span = document.createElement('span');\n        span.className = className;\n        span.appendChild(node);\n        div.appendChild(span);\n        return;\n      }\n      div.appendChild(node);\n    }\n\n    let i0 = selectedMatchIdx, i1 = i0 + 1;\n    if (highlightAll) {\n      i0 = 0;\n      i1 = matches.length;\n    } else if (!isSelectedPage) {\n      // Not highlighting all and this isn't the selected page, so do nothing.\n      return;\n    }\n\n    for (let i = i0; i < i1; i++) {\n      let match = matches[i];\n      let begin = match.begin;\n      let end = match.end;\n      const isSelected = (isSelectedPage && i === selectedMatchIdx);\n      const highlightSuffix = (isSelected ? ' selected' : '');\n\n      if (isSelected) { // Attempt to scroll the selected match into view.\n        findController.scrollMatchIntoView({\n          element: textDivs[begin.divIdx],\n          pageIndex: pageIdx,\n          matchIndex: selectedMatchIdx,\n        });\n      }\n\n      // Match inside new div.\n      if (!prevEnd || begin.divIdx !== prevEnd.divIdx) {\n        // If there was a previous div, then add the text at the end.\n        if (prevEnd !== null) {\n          appendTextToDiv(prevEnd.divIdx, prevEnd.offset, infinity.offset);\n        }\n        // Clear the divs and set the content until the starting point.\n        beginText(begin);\n      } else {\n        appendTextToDiv(prevEnd.divIdx, prevEnd.offset, begin.offset);\n      }\n\n      if (begin.divIdx === end.divIdx) {\n        appendTextToDiv(begin.divIdx, begin.offset, end.offset,\n                        'highlight' + highlightSuffix);\n      } else {\n        appendTextToDiv(begin.divIdx, begin.offset, infinity.offset,\n                        'highlight begin' + highlightSuffix);\n        for (let n0 = begin.divIdx + 1, n1 = end.divIdx; n0 < n1; n0++) {\n          textDivs[n0].className = 'highlight middle' + highlightSuffix;\n        }\n        beginText(end, 'highlight end' + highlightSuffix);\n      }\n      prevEnd = end;\n    }\n\n    if (prevEnd) {\n      appendTextToDiv(prevEnd.divIdx, prevEnd.offset, infinity.offset);\n    }\n  }\n\n  _updateMatches() {\n    // Only show matches when all rendering is done.\n    if (!this.renderingDone) {\n      return;\n    }\n    const {\n      findController, matches, pageIdx, textContentItemsStr, textDivs,\n    } = this;\n    let clearedUntilDivIdx = -1;\n\n    // Clear all current matches.\n    for (let i = 0, ii = matches.length; i < ii; i++) {\n      let match = matches[i];\n      let begin = Math.max(clearedUntilDivIdx, match.begin.divIdx);\n      for (let n = begin, end = match.end.divIdx; n <= end; n++) {\n        let div = textDivs[n];\n        div.textContent = textContentItemsStr[n];\n        div.className = '';\n      }\n      clearedUntilDivIdx = match.end.divIdx + 1;\n    }\n\n    if (!findController || !findController.highlightMatches) {\n      return;\n    }\n    // Convert the matches on the `findController` into the match format\n    // used for the textLayer.\n    const pageMatches = findController.pageMatches[pageIdx] || null;\n    const pageMatchesLength = findController.pageMatchesLength[pageIdx] || null;\n\n    this.matches = this._convertMatches(pageMatches, pageMatchesLength);\n    this._renderMatches(this.matches);\n  }\n\n  /**\n   * Improves text selection by adding an additional div where the mouse was\n   * clicked. This reduces flickering of the content if the mouse is slowly\n   * dragged up or down.\n   *\n   * @private\n   */\n  _bindMouse() {\n    let div = this.textLayerDiv;\n    let expandDivsTimer = null;\n\n    div.addEventListener('mousedown', (evt) => {\n      if (this.enhanceTextSelection && this.textLayerRenderTask) {\n        this.textLayerRenderTask.expandTextDivs(true);\n        if ((typeof PDFJSDev === 'undefined' ||\n             !PDFJSDev.test('FIREFOX || MOZCENTRAL')) &&\n            expandDivsTimer) {\n          clearTimeout(expandDivsTimer);\n          expandDivsTimer = null;\n        }\n        return;\n      }\n\n      let end = div.querySelector('.endOfContent');\n      if (!end) {\n        return;\n      }\n      if (typeof PDFJSDev === 'undefined' ||\n          !PDFJSDev.test('FIREFOX || MOZCENTRAL')) {\n        // On non-Firefox browsers, the selection will feel better if the height\n        // of the `endOfContent` div is adjusted to start at mouse click\n        // location. This avoids flickering when the selection moves up.\n        // However it does not work when selection is started on empty space.\n        let adjustTop = evt.target !== div;\n        if (typeof PDFJSDev === 'undefined' || PDFJSDev.test('GENERIC')) {\n          adjustTop = adjustTop && window.getComputedStyle(end).\n            getPropertyValue('-moz-user-select') !== 'none';\n        }\n        if (adjustTop) {\n          let divBounds = div.getBoundingClientRect();\n          let r = Math.max(0, (evt.pageY - divBounds.top) / divBounds.height);\n          end.style.top = (r * 100).toFixed(2) + '%';\n        }\n      }\n      end.classList.add('active');\n    });\n\n    div.addEventListener('mouseup', () => {\n      if (this.enhanceTextSelection && this.textLayerRenderTask) {\n        if (typeof PDFJSDev === 'undefined' ||\n            !PDFJSDev.test('FIREFOX || MOZCENTRAL')) {\n          expandDivsTimer = setTimeout(() => {\n            if (this.textLayerRenderTask) {\n              this.textLayerRenderTask.expandTextDivs(false);\n            }\n            expandDivsTimer = null;\n          }, EXPAND_DIVS_TIMEOUT);\n        } else {\n          this.textLayerRenderTask.expandTextDivs(false);\n        }\n        return;\n      }\n\n      let end = div.querySelector('.endOfContent');\n      if (!end) {\n        return;\n      }\n      if (typeof PDFJSDev === 'undefined' ||\n          !PDFJSDev.test('FIREFOX || MOZCENTRAL')) {\n        end.style.top = '';\n      }\n      end.classList.remove('active');\n    });\n  }\n}\n\n/**\n * @implements IPDFTextLayerFactory\n */\nclass DefaultTextLayerFactory {\n  /**\n   * @param {HTMLDivElement} textLayerDiv\n   * @param {number} pageIndex\n   * @param {PageViewport} viewport\n   * @param {boolean} enhanceTextSelection\n   * @returns {TextLayerBuilder}\n   */\n  createTextLayerBuilder(textLayerDiv, pageIndex, viewport,\n                         enhanceTextSelection = false) {\n    return new TextLayerBuilder({\n      textLayerDiv,\n      pageIndex,\n      viewport,\n      enhanceTextSelection,\n    });\n  }\n}\n\nexport {\n  TextLayerBuilder,\n  DefaultTextLayerFactory,\n};\n","/* Copyright 2013 Mozilla Foundation\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *     http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport {\n  apiCompatibilityParams, createObjectURL, createValidAbsoluteUrl, URL\n} from 'pdfjs-lib';\n\nif (typeof PDFJSDev !== 'undefined' && !PDFJSDev.test('CHROME || GENERIC')) {\n  throw new Error('Module \"pdfjs-web/download_manager\" shall not be used ' +\n                  'outside CHROME and GENERIC builds.');\n}\n\nconst DISABLE_CREATE_OBJECT_URL =\n  apiCompatibilityParams.disableCreateObjectURL || false;\n\nfunction download(blobUrl, filename) {\n  let a = document.createElement('a');\n  if (!a.click) {\n    throw new Error('DownloadManager: \"a.click()\" is not supported.');\n  }\n  a.href = blobUrl;\n  a.target = '_parent';\n  // Use a.download if available. This increases the likelihood that\n  // the file is downloaded instead of opened by another PDF plugin.\n  if ('download' in a) {\n    a.download = filename;\n  }\n  // <a> must be in the document for IE and recent Firefox versions,\n  // otherwise .click() is ignored.\n  (document.body || document.documentElement).appendChild(a);\n  a.click();\n  a.remove();\n}\n\nclass DownloadManager {\n  constructor({ disableCreateObjectURL = DISABLE_CREATE_OBJECT_URL, }) {\n    this.disableCreateObjectURL = disableCreateObjectURL;\n  }\n\n  downloadUrl(url, filename) {\n    if (!createValidAbsoluteUrl(url, 'http://example.com')) {\n      return; // restricted/invalid URL\n    }\n    download(url + '#pdfjs.action=download', filename);\n  }\n\n  downloadData(data, filename, contentType) {\n    if (navigator.msSaveBlob) { // IE10 and above\n      navigator.msSaveBlob(new Blob([data], { type: contentType, }), filename);\n      return;\n    }\n    let blobUrl = createObjectURL(data, contentType,\n                                  this.disableCreateObjectURL);\n    download(blobUrl, filename);\n  }\n\n  download(blob, url, filename) {\n    if (navigator.msSaveBlob) {\n      // IE10 / IE11\n      if (!navigator.msSaveBlob(blob, filename)) {\n        this.downloadUrl(url, filename);\n      }\n      return;\n    }\n\n    if (this.disableCreateObjectURL) {\n      // URL.createObjectURL is not supported\n      this.downloadUrl(url, filename);\n      return;\n    }\n\n    let blobUrl = URL.createObjectURL(blob);\n    download(blobUrl, filename);\n  }\n}\n\nexport {\n  DownloadManager,\n};\n","/* Copyright 2017 Mozilla Foundation\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *     http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport '../external/webL10n/l10n';\n\nlet webL10n = document.webL10n;\n\nclass GenericL10n {\n  constructor(lang) {\n    this._lang = lang;\n    this._ready = new Promise((resolve, reject) => {\n      webL10n.setLanguage(lang, () => {\n        resolve(webL10n);\n      });\n    });\n  }\n\n  async getLanguage() {\n    const l10n = await this._ready;\n    return l10n.getLanguage();\n  }\n\n  async getDirection() {\n    const l10n = await this._ready;\n    return l10n.getDirection();\n  }\n\n  async get(property, args, fallback) {\n    const l10n = await this._ready;\n    return l10n.get(property, args, fallback);\n  }\n\n  async translate(element) {\n    const l10n = await this._ready;\n    return l10n.translate(element);\n  }\n}\n\nexport {\n  GenericL10n,\n};\n","/**\n * Copyright (c) 2011-2013 Fabien Cazenave, Mozilla.\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n/*\n  Additional modifications for PDF.js project:\n    - Disables language initialization on page loading.\n    - Disables document translation on page loading.\n    - Removes consoleWarn and consoleLog and use console.log/warn directly.\n    - Removes window._ assignment.\n    - Remove compatibility code for OldIE.\n*/\n\n/*jshint browser: true, devel: true, es5: true, globalstrict: true */\n'use strict';\n\ndocument.webL10n = (function(window, document, undefined) {\n  var gL10nData = {};\n  var gTextData = '';\n  var gTextProp = 'textContent';\n  var gLanguage = '';\n  var gMacros = {};\n  var gReadyState = 'loading';\n\n\n  /**\n   * Synchronously loading l10n resources significantly minimizes flickering\n   * from displaying the app with non-localized strings and then updating the\n   * strings. Although this will block all script execution on this page, we\n   * expect that the l10n resources are available locally on flash-storage.\n   *\n   * As synchronous XHR is generally considered as a bad idea, we're still\n   * loading l10n resources asynchronously -- but we keep this in a setting,\n   * just in case... and applications using this library should hide their\n   * content until the `localized' event happens.\n   */\n\n  var gAsyncResourceLoading = true; // read-only\n\n\n  /**\n   * DOM helpers for the so-called \"HTML API\".\n   *\n   * These functions are written for modern browsers. For old versions of IE,\n   * they're overridden in the 'startup' section at the end of this file.\n   */\n\n  function getL10nResourceLinks() {\n    return document.querySelectorAll('link[type=\"application/l10n\"]');\n  }\n\n  function getL10nDictionary() {\n    var script = document.querySelector('script[type=\"application/l10n\"]');\n    // TODO: support multiple and external JSON dictionaries\n    return script ? JSON.parse(script.innerHTML) : null;\n  }\n\n  function getTranslatableChildren(element) {\n    return element ? element.querySelectorAll('*[data-l10n-id]') : [];\n  }\n\n  function getL10nAttributes(element) {\n    if (!element)\n      return {};\n\n    var l10nId = element.getAttribute('data-l10n-id');\n    var l10nArgs = element.getAttribute('data-l10n-args');\n    var args = {};\n    if (l10nArgs) {\n      try {\n        args = JSON.parse(l10nArgs);\n      } catch (e) {\n        console.warn('could not parse arguments for #' + l10nId);\n      }\n    }\n    return { id: l10nId, args: args };\n  }\n\n  function fireL10nReadyEvent(lang) {\n    var evtObject = document.createEvent('Event');\n    evtObject.initEvent('localized', true, false);\n    evtObject.language = lang;\n    document.dispatchEvent(evtObject);\n  }\n\n  function xhrLoadText(url, onSuccess, onFailure) {\n    onSuccess = onSuccess || function _onSuccess(data) {};\n    onFailure = onFailure || function _onFailure() {};\n\n    var xhr = new XMLHttpRequest();\n    xhr.open('GET', url, gAsyncResourceLoading);\n    if (xhr.overrideMimeType) {\n      xhr.overrideMimeType('text/plain; charset=utf-8');\n    }\n    xhr.onreadystatechange = function() {\n      if (xhr.readyState == 4) {\n        if (xhr.status == 200 || xhr.status === 0) {\n          onSuccess(xhr.responseText);\n        } else {\n          onFailure();\n        }\n      }\n    };\n    xhr.onerror = onFailure;\n    xhr.ontimeout = onFailure;\n\n    // in Firefox OS with the app:// protocol, trying to XHR a non-existing\n    // URL will raise an exception here -- hence this ugly try...catch.\n    try {\n      xhr.send(null);\n    } catch (e) {\n      onFailure();\n    }\n  }\n\n\n  /**\n   * l10n resource parser:\n   *  - reads (async XHR) the l10n resource matching `lang';\n   *  - imports linked resources (synchronously) when specified;\n   *  - parses the text data (fills `gL10nData' and `gTextData');\n   *  - triggers success/failure callbacks when done.\n   *\n   * @param {string} href\n   *    URL of the l10n resource to parse.\n   *\n   * @param {string} lang\n   *    locale (language) to parse. Must be a lowercase string.\n   *\n   * @param {Function} successCallback\n   *    triggered when the l10n resource has been successfully parsed.\n   *\n   * @param {Function} failureCallback\n   *    triggered when the an error has occurred.\n   *\n   * @return {void}\n   *    uses the following global variables: gL10nData, gTextData, gTextProp.\n   */\n\n  function parseResource(href, lang, successCallback, failureCallback) {\n    var baseURL = href.replace(/[^\\/]*$/, '') || './';\n\n    // handle escaped characters (backslashes) in a string\n    function evalString(text) {\n      if (text.lastIndexOf('\\\\') < 0)\n        return text;\n      return text.replace(/\\\\\\\\/g, '\\\\')\n                 .replace(/\\\\n/g, '\\n')\n                 .replace(/\\\\r/g, '\\r')\n                 .replace(/\\\\t/g, '\\t')\n                 .replace(/\\\\b/g, '\\b')\n                 .replace(/\\\\f/g, '\\f')\n                 .replace(/\\\\{/g, '{')\n                 .replace(/\\\\}/g, '}')\n                 .replace(/\\\\\"/g, '\"')\n                 .replace(/\\\\'/g, \"'\");\n    }\n\n    // parse *.properties text data into an l10n dictionary\n    // If gAsyncResourceLoading is false, then the callback will be called\n    // synchronously. Otherwise it is called asynchronously.\n    function parseProperties(text, parsedPropertiesCallback) {\n      var dictionary = {};\n\n      // token expressions\n      var reBlank = /^\\s*|\\s*$/;\n      var reComment = /^\\s*#|^\\s*$/;\n      var reSection = /^\\s*\\[(.*)\\]\\s*$/;\n      var reImport = /^\\s*@import\\s+url\\((.*)\\)\\s*$/i;\n      var reSplit = /^([^=\\s]*)\\s*=\\s*(.+)$/; // TODO: escape EOLs with '\\'\n\n      // parse the *.properties file into an associative array\n      function parseRawLines(rawText, extendedSyntax, parsedRawLinesCallback) {\n        var entries = rawText.replace(reBlank, '').split(/[\\r\\n]+/);\n        var currentLang = '*';\n        var genericLang = lang.split('-', 1)[0];\n        var skipLang = false;\n        var match = '';\n\n        function nextEntry() {\n          // Use infinite loop instead of recursion to avoid reaching the\n          // maximum recursion limit for content with many lines.\n          while (true) {\n            if (!entries.length) {\n              parsedRawLinesCallback();\n              return;\n            }\n            var line = entries.shift();\n\n            // comment or blank line?\n            if (reComment.test(line))\n              continue;\n\n            // the extended syntax supports [lang] sections and @import rules\n            if (extendedSyntax) {\n              match = reSection.exec(line);\n              if (match) { // section start?\n                // RFC 4646, section 4.4, \"All comparisons MUST be performed\n                // in a case-insensitive manner.\"\n\n                currentLang = match[1].toLowerCase();\n                skipLang = (currentLang !== '*') &&\n                    (currentLang !== lang) && (currentLang !== genericLang);\n                continue;\n              } else if (skipLang) {\n                continue;\n              }\n              match = reImport.exec(line);\n              if (match) { // @import rule?\n                loadImport(baseURL + match[1], nextEntry);\n                return;\n              }\n            }\n\n            // key-value pair\n            var tmp = line.match(reSplit);\n            if (tmp && tmp.length == 3) {\n              dictionary[tmp[1]] = evalString(tmp[2]);\n            }\n          }\n        }\n        nextEntry();\n      }\n\n      // import another *.properties file\n      function loadImport(url, callback) {\n        xhrLoadText(url, function(content) {\n          parseRawLines(content, false, callback); // don't allow recursive imports\n        }, function () {\n          console.warn(url + ' not found.');\n          callback();\n        });\n      }\n\n      // fill the dictionary\n      parseRawLines(text, true, function() {\n        parsedPropertiesCallback(dictionary);\n      });\n    }\n\n    // load and parse l10n data (warning: global variables are used here)\n    xhrLoadText(href, function(response) {\n      gTextData += response; // mostly for debug\n\n      // parse *.properties text data into an l10n dictionary\n      parseProperties(response, function(data) {\n\n        // find attribute descriptions, if any\n        for (var key in data) {\n          var id, prop, index = key.lastIndexOf('.');\n          if (index > 0) { // an attribute has been specified\n            id = key.substring(0, index);\n            prop = key.substring(index + 1);\n          } else { // no attribute: assuming text content by default\n            id = key;\n            prop = gTextProp;\n          }\n          if (!gL10nData[id]) {\n            gL10nData[id] = {};\n          }\n          gL10nData[id][prop] = data[key];\n        }\n\n        // trigger callback\n        if (successCallback) {\n          successCallback();\n        }\n      });\n    }, failureCallback);\n  }\n\n  // load and parse all resources for the specified locale\n  function loadLocale(lang, callback) {\n    // RFC 4646, section 2.1 states that language tags have to be treated as\n    // case-insensitive. Convert to lowercase for case-insensitive comparisons.\n    if (lang) {\n      lang = lang.toLowerCase();\n    }\n\n    callback = callback || function _callback() {};\n\n    clear();\n    gLanguage = lang;\n\n    // check all <link type=\"application/l10n\" href=\"...\" /> nodes\n    // and load the resource files\n    var langLinks = getL10nResourceLinks();\n    var langCount = langLinks.length;\n    if (langCount === 0) {\n      // we might have a pre-compiled dictionary instead\n      var dict = getL10nDictionary();\n      if (dict && dict.locales && dict.default_locale) {\n        console.log('using the embedded JSON directory, early way out');\n        gL10nData = dict.locales[lang];\n        if (!gL10nData) {\n          var defaultLocale = dict.default_locale.toLowerCase();\n          for (var anyCaseLang in dict.locales) {\n            anyCaseLang = anyCaseLang.toLowerCase();\n            if (anyCaseLang === lang) {\n              gL10nData = dict.locales[lang];\n              break;\n            } else if (anyCaseLang === defaultLocale) {\n              gL10nData = dict.locales[defaultLocale];\n            }\n          }\n        }\n        callback();\n      } else {\n        console.log('no resource to load, early way out');\n      }\n      // early way out\n      fireL10nReadyEvent(lang);\n      gReadyState = 'complete';\n      return;\n    }\n\n    // start the callback when all resources are loaded\n    var onResourceLoaded = null;\n    var gResourceCount = 0;\n    onResourceLoaded = function() {\n      gResourceCount++;\n      if (gResourceCount >= langCount) {\n        callback();\n        fireL10nReadyEvent(lang);\n        gReadyState = 'complete';\n      }\n    };\n\n    // load all resource files\n    function L10nResourceLink(link) {\n      var href = link.href;\n      // Note: If |gAsyncResourceLoading| is false, then the following callbacks\n      // are synchronously called.\n      this.load = function(lang, callback) {\n        parseResource(href, lang, callback, function() {\n          console.warn(href + ' not found.');\n          // lang not found, used default resource instead\n          console.warn('\"' + lang + '\" resource not found');\n          gLanguage = '';\n          // Resource not loaded, but we still need to call the callback.\n          callback();\n        });\n      };\n    }\n\n    for (var i = 0; i < langCount; i++) {\n      var resource = new L10nResourceLink(langLinks[i]);\n      resource.load(lang, onResourceLoaded);\n    }\n  }\n\n  // clear all l10n data\n  function clear() {\n    gL10nData = {};\n    gTextData = '';\n    gLanguage = '';\n    // TODO: clear all non predefined macros.\n    // There's no such macro /yet/ but we're planning to have some...\n  }\n\n\n  /**\n   * Get rules for plural forms (shared with JetPack), see:\n   * http://unicode.org/repos/cldr-tmp/trunk/diff/supplemental/language_plural_rules.html\n   * https://github.com/mozilla/addon-sdk/blob/master/python-lib/plural-rules-generator.p\n   *\n   * @param {string} lang\n   *    locale (language) used.\n   *\n   * @return {Function}\n   *    returns a function that gives the plural form name for a given integer:\n   *       var fun = getPluralRules('en');\n   *       fun(1)    -> 'one'\n   *       fun(0)    -> 'other'\n   *       fun(1000) -> 'other'.\n   */\n\n  function getPluralRules(lang) {\n    var locales2rules = {\n      'af': 3,\n      'ak': 4,\n      'am': 4,\n      'ar': 1,\n      'asa': 3,\n      'az': 0,\n      'be': 11,\n      'bem': 3,\n      'bez': 3,\n      'bg': 3,\n      'bh': 4,\n      'bm': 0,\n      'bn': 3,\n      'bo': 0,\n      'br': 20,\n      'brx': 3,\n      'bs': 11,\n      'ca': 3,\n      'cgg': 3,\n      'chr': 3,\n      'cs': 12,\n      'cy': 17,\n      'da': 3,\n      'de': 3,\n      'dv': 3,\n      'dz': 0,\n      'ee': 3,\n      'el': 3,\n      'en': 3,\n      'eo': 3,\n      'es': 3,\n      'et': 3,\n      'eu': 3,\n      'fa': 0,\n      'ff': 5,\n      'fi': 3,\n      'fil': 4,\n      'fo': 3,\n      'fr': 5,\n      'fur': 3,\n      'fy': 3,\n      'ga': 8,\n      'gd': 24,\n      'gl': 3,\n      'gsw': 3,\n      'gu': 3,\n      'guw': 4,\n      'gv': 23,\n      'ha': 3,\n      'haw': 3,\n      'he': 2,\n      'hi': 4,\n      'hr': 11,\n      'hu': 0,\n      'id': 0,\n      'ig': 0,\n      'ii': 0,\n      'is': 3,\n      'it': 3,\n      'iu': 7,\n      'ja': 0,\n      'jmc': 3,\n      'jv': 0,\n      'ka': 0,\n      'kab': 5,\n      'kaj': 3,\n      'kcg': 3,\n      'kde': 0,\n      'kea': 0,\n      'kk': 3,\n      'kl': 3,\n      'km': 0,\n      'kn': 0,\n      'ko': 0,\n      'ksb': 3,\n      'ksh': 21,\n      'ku': 3,\n      'kw': 7,\n      'lag': 18,\n      'lb': 3,\n      'lg': 3,\n      'ln': 4,\n      'lo': 0,\n      'lt': 10,\n      'lv': 6,\n      'mas': 3,\n      'mg': 4,\n      'mk': 16,\n      'ml': 3,\n      'mn': 3,\n      'mo': 9,\n      'mr': 3,\n      'ms': 0,\n      'mt': 15,\n      'my': 0,\n      'nah': 3,\n      'naq': 7,\n      'nb': 3,\n      'nd': 3,\n      'ne': 3,\n      'nl': 3,\n      'nn': 3,\n      'no': 3,\n      'nr': 3,\n      'nso': 4,\n      'ny': 3,\n      'nyn': 3,\n      'om': 3,\n      'or': 3,\n      'pa': 3,\n      'pap': 3,\n      'pl': 13,\n      'ps': 3,\n      'pt': 3,\n      'rm': 3,\n      'ro': 9,\n      'rof': 3,\n      'ru': 11,\n      'rwk': 3,\n      'sah': 0,\n      'saq': 3,\n      'se': 7,\n      'seh': 3,\n      'ses': 0,\n      'sg': 0,\n      'sh': 11,\n      'shi': 19,\n      'sk': 12,\n      'sl': 14,\n      'sma': 7,\n      'smi': 7,\n      'smj': 7,\n      'smn': 7,\n      'sms': 7,\n      'sn': 3,\n      'so': 3,\n      'sq': 3,\n      'sr': 11,\n      'ss': 3,\n      'ssy': 3,\n      'st': 3,\n      'sv': 3,\n      'sw': 3,\n      'syr': 3,\n      'ta': 3,\n      'te': 3,\n      'teo': 3,\n      'th': 0,\n      'ti': 4,\n      'tig': 3,\n      'tk': 3,\n      'tl': 4,\n      'tn': 3,\n      'to': 0,\n      'tr': 0,\n      'ts': 3,\n      'tzm': 22,\n      'uk': 11,\n      'ur': 3,\n      've': 3,\n      'vi': 0,\n      'vun': 3,\n      'wa': 4,\n      'wae': 3,\n      'wo': 0,\n      'xh': 3,\n      'xog': 3,\n      'yo': 0,\n      'zh': 0,\n      'zu': 3\n    };\n\n    // utility functions for plural rules methods\n    function isIn(n, list) {\n      return list.indexOf(n) !== -1;\n    }\n    function isBetween(n, start, end) {\n      return start <= n && n <= end;\n    }\n\n    // list of all plural rules methods:\n    // map an integer to the plural form name to use\n    var pluralRules = {\n      '0': function(n) {\n        return 'other';\n      },\n      '1': function(n) {\n        if ((isBetween((n % 100), 3, 10)))\n          return 'few';\n        if (n === 0)\n          return 'zero';\n        if ((isBetween((n % 100), 11, 99)))\n          return 'many';\n        if (n == 2)\n          return 'two';\n        if (n == 1)\n          return 'one';\n        return 'other';\n      },\n      '2': function(n) {\n        if (n !== 0 && (n % 10) === 0)\n          return 'many';\n        if (n == 2)\n          return 'two';\n        if (n == 1)\n          return 'one';\n        return 'other';\n      },\n      '3': function(n) {\n        if (n == 1)\n          return 'one';\n        return 'other';\n      },\n      '4': function(n) {\n        if ((isBetween(n, 0, 1)))\n          return 'one';\n        return 'other';\n      },\n      '5': function(n) {\n        if ((isBetween(n, 0, 2)) && n != 2)\n          return 'one';\n        return 'other';\n      },\n      '6': function(n) {\n        if (n === 0)\n          return 'zero';\n        if ((n % 10) == 1 && (n % 100) != 11)\n          return 'one';\n        return 'other';\n      },\n      '7': function(n) {\n        if (n == 2)\n          return 'two';\n        if (n == 1)\n          return 'one';\n        return 'other';\n      },\n      '8': function(n) {\n        if ((isBetween(n, 3, 6)))\n          return 'few';\n        if ((isBetween(n, 7, 10)))\n          return 'many';\n        if (n == 2)\n          return 'two';\n        if (n == 1)\n          return 'one';\n        return 'other';\n      },\n      '9': function(n) {\n        if (n === 0 || n != 1 && (isBetween((n % 100), 1, 19)))\n          return 'few';\n        if (n == 1)\n          return 'one';\n        return 'other';\n      },\n      '10': function(n) {\n        if ((isBetween((n % 10), 2, 9)) && !(isBetween((n % 100), 11, 19)))\n          return 'few';\n        if ((n % 10) == 1 && !(isBetween((n % 100), 11, 19)))\n          return 'one';\n        return 'other';\n      },\n      '11': function(n) {\n        if ((isBetween((n % 10), 2, 4)) && !(isBetween((n % 100), 12, 14)))\n          return 'few';\n        if ((n % 10) === 0 ||\n            (isBetween((n % 10), 5, 9)) ||\n            (isBetween((n % 100), 11, 14)))\n          return 'many';\n        if ((n % 10) == 1 && (n % 100) != 11)\n          return 'one';\n        return 'other';\n      },\n      '12': function(n) {\n        if ((isBetween(n, 2, 4)))\n          return 'few';\n        if (n == 1)\n          return 'one';\n        return 'other';\n      },\n      '13': function(n) {\n        if ((isBetween((n % 10), 2, 4)) && !(isBetween((n % 100), 12, 14)))\n          return 'few';\n        if (n != 1 && (isBetween((n % 10), 0, 1)) ||\n            (isBetween((n % 10), 5, 9)) ||\n            (isBetween((n % 100), 12, 14)))\n          return 'many';\n        if (n == 1)\n          return 'one';\n        return 'other';\n      },\n      '14': function(n) {\n        if ((isBetween((n % 100), 3, 4)))\n          return 'few';\n        if ((n % 100) == 2)\n          return 'two';\n        if ((n % 100) == 1)\n          return 'one';\n        return 'other';\n      },\n      '15': function(n) {\n        if (n === 0 || (isBetween((n % 100), 2, 10)))\n          return 'few';\n        if ((isBetween((n % 100), 11, 19)))\n          return 'many';\n        if (n == 1)\n          return 'one';\n        return 'other';\n      },\n      '16': function(n) {\n        if ((n % 10) == 1 && n != 11)\n          return 'one';\n        return 'other';\n      },\n      '17': function(n) {\n        if (n == 3)\n          return 'few';\n        if (n === 0)\n          return 'zero';\n        if (n == 6)\n          return 'many';\n        if (n == 2)\n          return 'two';\n        if (n == 1)\n          return 'one';\n        return 'other';\n      },\n      '18': function(n) {\n        if (n === 0)\n          return 'zero';\n        if ((isBetween(n, 0, 2)) && n !== 0 && n != 2)\n          return 'one';\n        return 'other';\n      },\n      '19': function(n) {\n        if ((isBetween(n, 2, 10)))\n          return 'few';\n        if ((isBetween(n, 0, 1)))\n          return 'one';\n        return 'other';\n      },\n      '20': function(n) {\n        if ((isBetween((n % 10), 3, 4) || ((n % 10) == 9)) && !(\n            isBetween((n % 100), 10, 19) ||\n            isBetween((n % 100), 70, 79) ||\n            isBetween((n % 100), 90, 99)\n            ))\n          return 'few';\n        if ((n % 1000000) === 0 && n !== 0)\n          return 'many';\n        if ((n % 10) == 2 && !isIn((n % 100), [12, 72, 92]))\n          return 'two';\n        if ((n % 10) == 1 && !isIn((n % 100), [11, 71, 91]))\n          return 'one';\n        return 'other';\n      },\n      '21': function(n) {\n        if (n === 0)\n          return 'zero';\n        if (n == 1)\n          return 'one';\n        return 'other';\n      },\n      '22': function(n) {\n        if ((isBetween(n, 0, 1)) || (isBetween(n, 11, 99)))\n          return 'one';\n        return 'other';\n      },\n      '23': function(n) {\n        if ((isBetween((n % 10), 1, 2)) || (n % 20) === 0)\n          return 'one';\n        return 'other';\n      },\n      '24': function(n) {\n        if ((isBetween(n, 3, 10) || isBetween(n, 13, 19)))\n          return 'few';\n        if (isIn(n, [2, 12]))\n          return 'two';\n        if (isIn(n, [1, 11]))\n          return 'one';\n        return 'other';\n      }\n    };\n\n    // return a function that gives the plural form name for a given integer\n    var index = locales2rules[lang.replace(/-.*$/, '')];\n    if (!(index in pluralRules)) {\n      console.warn('plural form unknown for [' + lang + ']');\n      return function() { return 'other'; };\n    }\n    return pluralRules[index];\n  }\n\n  // pre-defined 'plural' macro\n  gMacros.plural = function(str, param, key, prop) {\n    var n = parseFloat(param);\n    if (isNaN(n))\n      return str;\n\n    // TODO: support other properties (l20n still doesn't...)\n    if (prop != gTextProp)\n      return str;\n\n    // initialize _pluralRules\n    if (!gMacros._pluralRules) {\n      gMacros._pluralRules = getPluralRules(gLanguage);\n    }\n    var index = '[' + gMacros._pluralRules(n) + ']';\n\n    // try to find a [zero|one|two] key if it's defined\n    if (n === 0 && (key + '[zero]') in gL10nData) {\n      str = gL10nData[key + '[zero]'][prop];\n    } else if (n == 1 && (key + '[one]') in gL10nData) {\n      str = gL10nData[key + '[one]'][prop];\n    } else if (n == 2 && (key + '[two]') in gL10nData) {\n      str = gL10nData[key + '[two]'][prop];\n    } else if ((key + index) in gL10nData) {\n      str = gL10nData[key + index][prop];\n    } else if ((key + '[other]') in gL10nData) {\n      str = gL10nData[key + '[other]'][prop];\n    }\n\n    return str;\n  };\n\n\n  /**\n   * l10n dictionary functions\n   */\n\n  // fetch an l10n object, warn if not found, apply `args' if possible\n  function getL10nData(key, args, fallback) {\n    var data = gL10nData[key];\n    if (!data) {\n      console.warn('#' + key + ' is undefined.');\n      if (!fallback) {\n        return null;\n      }\n      data = fallback;\n    }\n\n    /** This is where l10n expressions should be processed.\n      * The plan is to support C-style expressions from the l20n project;\n      * until then, only two kinds of simple expressions are supported:\n      *   {[ index ]} and {{ arguments }}.\n      */\n    var rv = {};\n    for (var prop in data) {\n      var str = data[prop];\n      str = substIndexes(str, args, key, prop);\n      str = substArguments(str, args, key);\n      rv[prop] = str;\n    }\n    return rv;\n  }\n\n  // replace {[macros]} with their values\n  function substIndexes(str, args, key, prop) {\n    var reIndex = /\\{\\[\\s*([a-zA-Z]+)\\(([a-zA-Z]+)\\)\\s*\\]\\}/;\n    var reMatch = reIndex.exec(str);\n    if (!reMatch || !reMatch.length)\n      return str;\n\n    // an index/macro has been found\n    // Note: at the moment, only one parameter is supported\n    var macroName = reMatch[1];\n    var paramName = reMatch[2];\n    var param;\n    if (args && paramName in args) {\n      param = args[paramName];\n    } else if (paramName in gL10nData) {\n      param = gL10nData[paramName];\n    }\n\n    // there's no macro parser yet: it has to be defined in gMacros\n    if (macroName in gMacros) {\n      var macro = gMacros[macroName];\n      str = macro(str, param, key, prop);\n    }\n    return str;\n  }\n\n  // replace {{arguments}} with their values\n  function substArguments(str, args, key) {\n    var reArgs = /\\{\\{\\s*(.+?)\\s*\\}\\}/g;\n    return str.replace(reArgs, function(matched_text, arg) {\n      if (args && arg in args) {\n        return args[arg];\n      }\n      if (arg in gL10nData) {\n        return gL10nData[arg];\n      }\n      console.log('argument {{' + arg + '}} for #' + key + ' is undefined.');\n      return matched_text;\n    });\n  }\n\n  // translate an HTML element\n  function translateElement(element) {\n    var l10n = getL10nAttributes(element);\n    if (!l10n.id)\n      return;\n\n    // get the related l10n object\n    var data = getL10nData(l10n.id, l10n.args);\n    if (!data) {\n      console.warn('#' + l10n.id + ' is undefined.');\n      return;\n    }\n\n    // translate element (TODO: security checks?)\n    if (data[gTextProp]) { // XXX\n      if (getChildElementCount(element) === 0) {\n        element[gTextProp] = data[gTextProp];\n      } else {\n        // this element has element children: replace the content of the first\n        // (non-empty) child textNode and clear other child textNodes\n        var children = element.childNodes;\n        var found = false;\n        for (var i = 0, l = children.length; i < l; i++) {\n          if (children[i].nodeType === 3 && /\\S/.test(children[i].nodeValue)) {\n            if (found) {\n              children[i].nodeValue = '';\n            } else {\n              children[i].nodeValue = data[gTextProp];\n              found = true;\n            }\n          }\n        }\n        // if no (non-empty) textNode is found, insert a textNode before the\n        // first element child.\n        if (!found) {\n          var textNode = document.createTextNode(data[gTextProp]);\n          element.insertBefore(textNode, element.firstChild);\n        }\n      }\n      delete data[gTextProp];\n    }\n\n    for (var k in data) {\n      element[k] = data[k];\n    }\n  }\n\n  // webkit browsers don't currently support 'children' on SVG elements...\n  function getChildElementCount(element) {\n    if (element.children) {\n      return element.children.length;\n    }\n    if (typeof element.childElementCount !== 'undefined') {\n      return element.childElementCount;\n    }\n    var count = 0;\n    for (var i = 0; i < element.childNodes.length; i++) {\n      count += element.nodeType === 1 ? 1 : 0;\n    }\n    return count;\n  }\n\n  // translate an HTML subtree\n  function translateFragment(element) {\n    element = element || document.documentElement;\n\n    // check all translatable children (= w/ a `data-l10n-id' attribute)\n    var children = getTranslatableChildren(element);\n    var elementCount = children.length;\n    for (var i = 0; i < elementCount; i++) {\n      translateElement(children[i]);\n    }\n\n    // translate element itself if necessary\n    translateElement(element);\n  }\n\n  return {\n    // get a localized string\n    get: function(key, args, fallbackString) {\n      var index = key.lastIndexOf('.');\n      var prop = gTextProp;\n      if (index > 0) { // An attribute has been specified\n        prop = key.substring(index + 1);\n        key = key.substring(0, index);\n      }\n      var fallback;\n      if (fallbackString) {\n        fallback = {};\n        fallback[prop] = fallbackString;\n      }\n      var data = getL10nData(key, args, fallback);\n      if (data && prop in data) {\n        return data[prop];\n      }\n      return '{{' + key + '}}';\n    },\n\n    // debug\n    getData: function() { return gL10nData; },\n    getText: function() { return gTextData; },\n\n    // get|set the document language\n    getLanguage: function() { return gLanguage; },\n    setLanguage: function(lang, callback) {\n      loadLocale(lang, function() {\n        if (callback)\n          callback();\n      });\n    },\n\n    // get the direction (ltr|rtl) of the current language\n    getDirection: function() {\n      // http://www.w3.org/International/questions/qa-scripts\n      // Arabic, Hebrew, Farsi, Pashto, Urdu\n      var rtlList = ['ar', 'he', 'fa', 'ps', 'ur'];\n      var shortCode = gLanguage.split('-', 1)[0];\n      return (rtlList.indexOf(shortCode) >= 0) ? 'rtl' : 'ltr';\n    },\n\n    // translate an element or document fragment\n    translate: translateFragment,\n\n    // this can be used to prevent race conditions\n    getReadyState: function() { return gReadyState; },\n    ready: function(callback) {\n      if (!callback) {\n        return;\n      } else if (gReadyState == 'complete' || gReadyState == 'interactive') {\n        window.setTimeout(function() {\n          callback();\n        });\n      } else if (document.addEventListener) {\n        document.addEventListener('localized', function once() {\n          document.removeEventListener('localized', once);\n          callback();\n        });\n      }\n    }\n  };\n}) (window, document);\n","/* Copyright 2012 Mozilla Foundation\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *     http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { getGlobalEventBus, scrollIntoView } from './ui_utils';\nimport { createPromiseCapability } from 'pdfjs-lib';\nimport { getCharacterType } from './pdf_find_utils';\n\nconst FindState = {\n  FOUND: 0,\n  NOT_FOUND: 1,\n  WRAPPED: 2,\n  PENDING: 3,\n};\n\nconst FIND_TIMEOUT = 250; // ms\nconst MATCH_SCROLL_OFFSET_TOP = -50; // px\nconst MATCH_SCROLL_OFFSET_LEFT = -400; // px\n\nconst CHARACTERS_TO_NORMALIZE = {\n  '\\u2018': '\\'', // Left single quotation mark\n  '\\u2019': '\\'', // Right single quotation mark\n  '\\u201A': '\\'', // Single low-9 quotation mark\n  '\\u201B': '\\'', // Single high-reversed-9 quotation mark\n  '\\u201C': '\"', // Left double quotation mark\n  '\\u201D': '\"', // Right double quotation mark\n  '\\u201E': '\"', // Double low-9 quotation mark\n  '\\u201F': '\"', // Double high-reversed-9 quotation mark\n  '\\u00BC': '1/4', // Vulgar fraction one quarter\n  '\\u00BD': '1/2', // Vulgar fraction one half\n  '\\u00BE': '3/4', // Vulgar fraction three quarters\n};\n\nlet normalizationRegex = null;\nfunction normalize(text) {\n  if (!normalizationRegex) {\n    // Compile the regular expression for text normalization once.\n    const replace = Object.keys(CHARACTERS_TO_NORMALIZE).join('');\n    normalizationRegex = new RegExp(`[${replace}]`, 'g');\n  }\n  return text.replace(normalizationRegex, function(ch) {\n    return CHARACTERS_TO_NORMALIZE[ch];\n  });\n}\n\n/**\n * @typedef {Object} PDFFindControllerOptions\n * @property {IPDFLinkService} linkService - The navigation/linking service.\n * @property {EventBus} eventBus - The application event bus.\n */\n\n/**\n * Provides search functionality to find a given string in a PDF document.\n */\nclass PDFFindController {\n  /**\n   * @param {PDFFindControllerOptions} options\n   */\n  constructor({ linkService, eventBus = getGlobalEventBus(), }) {\n    this._linkService = linkService;\n    this._eventBus = eventBus;\n\n    this._reset();\n    eventBus.on('findbarclose', this._onFindBarClose.bind(this));\n  }\n\n  get highlightMatches() {\n    return this._highlightMatches;\n  }\n\n  get pageMatches() {\n    return this._pageMatches;\n  }\n\n  get pageMatchesLength() {\n    return this._pageMatchesLength;\n  }\n\n  get selected() {\n    return this._selected;\n  }\n\n  get state() {\n    return this._state;\n  }\n\n  /**\n   * Set a reference to the PDF document in order to search it.\n   * Note that searching is not possible if this method is not called.\n   *\n   * @param {PDFDocumentProxy} pdfDocument - The PDF document to search.\n   */\n  setDocument(pdfDocument) {\n    if (this._pdfDocument) {\n      this._reset();\n    }\n    if (!pdfDocument) {\n      return;\n    }\n    this._pdfDocument = pdfDocument;\n    this._firstPageCapability.resolve();\n  }\n\n  executeCommand(cmd, state) {\n    if (!state) {\n      return;\n    }\n    const pdfDocument = this._pdfDocument;\n\n    if (this._state === null || this._shouldDirtyMatch(cmd, state)) {\n      this._dirtyMatch = true;\n    }\n    this._state = state;\n    if (cmd !== 'findhighlightallchange') {\n      this._updateUIState(FindState.PENDING);\n    }\n\n    this._firstPageCapability.promise.then(() => {\n      // If the document was closed before searching began, or if the search\n      // operation was relevant for a previously opened document, do nothing.\n      if (!this._pdfDocument ||\n          (pdfDocument && this._pdfDocument !== pdfDocument)) {\n        return;\n      }\n      this._extractText();\n\n      const findbarClosed = !this._highlightMatches;\n      const pendingTimeout = !!this._findTimeout;\n\n      if (this._findTimeout) {\n        clearTimeout(this._findTimeout);\n        this._findTimeout = null;\n      }\n      if (cmd === 'find') {\n        // Trigger the find action with a small delay to avoid starting the\n        // search when the user is still typing (saving resources).\n        this._findTimeout = setTimeout(() => {\n          this._nextMatch();\n          this._findTimeout = null;\n        }, FIND_TIMEOUT);\n      } else if (this._dirtyMatch) {\n        // Immediately trigger searching for non-'find' operations, when the\n        // current state needs to be reset and matches re-calculated.\n        this._nextMatch();\n      } else if (cmd === 'findagain') {\n        this._nextMatch();\n\n        // When the findbar was previously closed, and `highlightAll` is set,\n        // ensure that the matches on all active pages are highlighted again.\n        if (findbarClosed && this._state.highlightAll) {\n          this._updateAllPages();\n        }\n      } else if (cmd === 'findhighlightallchange') {\n        // If there was a pending search operation, synchronously trigger a new\n        // search *first* to ensure that the correct matches are highlighted.\n        if (pendingTimeout) {\n          this._nextMatch();\n        } else {\n          this._highlightMatches = true;\n        }\n        this._updateAllPages(); // Update the highlighting on all active pages.\n      } else {\n        this._nextMatch();\n      }\n    });\n  }\n\n  scrollMatchIntoView({ element = null, pageIndex = -1, matchIndex = -1, }) {\n    if (!this._scrollMatches || !element) {\n      return;\n    } else if (matchIndex === -1 || matchIndex !== this._selected.matchIdx) {\n      return;\n    } else if (pageIndex === -1 || pageIndex !== this._selected.pageIdx) {\n      return;\n    }\n    this._scrollMatches = false; // Ensure that scrolling only happens once.\n\n    const spot = {\n      top: MATCH_SCROLL_OFFSET_TOP,\n      left: MATCH_SCROLL_OFFSET_LEFT,\n    };\n    scrollIntoView(element, spot, /* skipOverflowHiddenElements = */ true);\n  }\n\n  _reset() {\n    this._highlightMatches = false;\n    this._scrollMatches = false;\n    this._pdfDocument = null;\n    this._pageMatches = [];\n    this._pageMatchesLength = [];\n    this._state = null;\n    this._selected = { // Currently selected match.\n      pageIdx: -1,\n      matchIdx: -1,\n    };\n    this._offset = { // Where the find algorithm currently is in the document.\n      pageIdx: null,\n      matchIdx: null,\n      wrapped: false,\n    };\n    this._extractTextPromises = [];\n    this._pageContents = []; // Stores the normalized text for each page.\n    this._matchesCountTotal = 0;\n    this._pagesToSearch = null;\n    this._pendingFindMatches = Object.create(null);\n    this._resumePageIdx = null;\n    this._dirtyMatch = false;\n    clearTimeout(this._findTimeout);\n    this._findTimeout = null;\n\n    this._firstPageCapability = createPromiseCapability();\n  }\n\n  /**\n   * @return {string} The (current) normalized search query.\n   */\n  get _query() {\n    if (this._state.query !== this._rawQuery) {\n      this._rawQuery = this._state.query;\n      this._normalizedQuery = normalize(this._state.query);\n    }\n    return this._normalizedQuery;\n  }\n\n  _shouldDirtyMatch(cmd, state) {\n    // When the search query changes, regardless of the actual search command\n    // used, always re-calculate matches to avoid errors (fixes bug 1030622).\n    if (state.query !== this._state.query) {\n      return true;\n    }\n    switch (cmd) {\n      case 'findagain':\n        const pageNumber = this._selected.pageIdx + 1;\n        const linkService = this._linkService;\n        // Only treat a 'findagain' event as a new search operation when it's\n        // *absolutely* certain that the currently selected match is no longer\n        // visible, e.g. as a result of the user scrolling in the document.\n        //\n        // NOTE: If only a simple `this._linkService.page` check was used here,\n        // there's a risk that consecutive 'findagain' operations could \"skip\"\n        // over matches at the top/bottom of pages thus making them completely\n        // inaccessible when there's multiple pages visible in the viewer.\n        if (pageNumber >= 1 && pageNumber <= linkService.pagesCount &&\n            pageNumber !== linkService.page &&\n            !linkService.isPageVisible(pageNumber)) {\n          return true;\n        }\n        return false;\n      case 'findhighlightallchange':\n        return false;\n    }\n    return true;\n  }\n\n  /**\n   * Helper for multi-term search that fills the `matchesWithLength` array\n   * and handles cases where one search term includes another search term (for\n   * example, \"tamed tame\" or \"this is\"). It looks for intersecting terms in\n   * the `matches` and keeps elements with a longer match length.\n   */\n  _prepareMatches(matchesWithLength, matches, matchesLength) {\n    function isSubTerm(matchesWithLength, currentIndex) {\n      const currentElem = matchesWithLength[currentIndex];\n      const nextElem = matchesWithLength[currentIndex + 1];\n\n      // Check for cases like \"TAMEd TAME\".\n      if (currentIndex < matchesWithLength.length - 1 &&\n          currentElem.match === nextElem.match) {\n        currentElem.skipped = true;\n        return true;\n      }\n\n      // Check for cases like \"thIS IS\".\n      for (let i = currentIndex - 1; i >= 0; i--) {\n        const prevElem = matchesWithLength[i];\n        if (prevElem.skipped) {\n          continue;\n        }\n        if (prevElem.match + prevElem.matchLength < currentElem.match) {\n          break;\n        }\n        if (prevElem.match + prevElem.matchLength >=\n            currentElem.match + currentElem.matchLength) {\n          currentElem.skipped = true;\n          return true;\n        }\n      }\n      return false;\n    }\n\n    // Sort the array of `{ match: <match>, matchLength: <matchLength> }`\n    // objects on increasing index first and on the length otherwise.\n    matchesWithLength.sort(function(a, b) {\n      return a.match === b.match ? a.matchLength - b.matchLength :\n                                   a.match - b.match;\n    });\n    for (let i = 0, len = matchesWithLength.length; i < len; i++) {\n      if (isSubTerm(matchesWithLength, i)) {\n        continue;\n      }\n      matches.push(matchesWithLength[i].match);\n      matchesLength.push(matchesWithLength[i].matchLength);\n    }\n  }\n\n  /**\n   * Determine if the search query constitutes a \"whole word\", by comparing the\n   * first/last character type with the preceding/following character type.\n   */\n  _isEntireWord(content, startIdx, length) {\n    if (startIdx > 0) {\n      const first = content.charCodeAt(startIdx);\n      const limit = content.charCodeAt(startIdx - 1);\n      if (getCharacterType(first) === getCharacterType(limit)) {\n        return false;\n      }\n    }\n    const endIdx = (startIdx + length - 1);\n    if (endIdx < (content.length - 1)) {\n      const last = content.charCodeAt(endIdx);\n      const limit = content.charCodeAt(endIdx + 1);\n      if (getCharacterType(last) === getCharacterType(limit)) {\n        return false;\n      }\n    }\n    return true;\n  }\n\n  _calculatePhraseMatch(query, pageIndex, pageContent, entireWord) {\n    const matches = [];\n    const queryLen = query.length;\n\n    let matchIdx = -queryLen;\n    while (true) {\n      matchIdx = pageContent.indexOf(query, matchIdx + queryLen);\n      if (matchIdx === -1) {\n        break;\n      }\n      if (entireWord && !this._isEntireWord(pageContent, matchIdx, queryLen)) {\n        continue;\n      }\n      matches.push(matchIdx);\n    }\n    this._pageMatches[pageIndex] = matches;\n  }\n\n  _calculateWordMatch(query, pageIndex, pageContent, entireWord) {\n    const matchesWithLength = [];\n\n    // Divide the query into pieces and search for text in each piece.\n    const queryArray = query.match(/\\S+/g);\n    for (let i = 0, len = queryArray.length; i < len; i++) {\n      const subquery = queryArray[i];\n      const subqueryLen = subquery.length;\n\n      let matchIdx = -subqueryLen;\n      while (true) {\n        matchIdx = pageContent.indexOf(subquery, matchIdx + subqueryLen);\n        if (matchIdx === -1) {\n          break;\n        }\n        if (entireWord &&\n            !this._isEntireWord(pageContent, matchIdx, subqueryLen)) {\n          continue;\n        }\n        // Other searches do not, so we store the length.\n        matchesWithLength.push({\n          match: matchIdx,\n          matchLength: subqueryLen,\n          skipped: false,\n        });\n      }\n    }\n\n    // Prepare arrays for storing the matches.\n    this._pageMatchesLength[pageIndex] = [];\n    this._pageMatches[pageIndex] = [];\n\n    // Sort `matchesWithLength`, remove intersecting terms and put the result\n    // into the two arrays.\n    this._prepareMatches(matchesWithLength, this._pageMatches[pageIndex],\n      this._pageMatchesLength[pageIndex]);\n  }\n\n  _calculateMatch(pageIndex) {\n    let pageContent = this._pageContents[pageIndex];\n    let query = this._query;\n    const { caseSensitive, entireWord, phraseSearch, } = this._state;\n\n    if (query.length === 0) {\n      // Do nothing: the matches should be wiped out already.\n      return;\n    }\n\n    if (!caseSensitive) {\n      pageContent = pageContent.toLowerCase();\n      query = query.toLowerCase();\n    }\n\n    if (phraseSearch) {\n      this._calculatePhraseMatch(query, pageIndex, pageContent, entireWord);\n    } else {\n      this._calculateWordMatch(query, pageIndex, pageContent, entireWord);\n    }\n\n    // When `highlightAll` is set, ensure that the matches on previously\n    // rendered (and still active) pages are correctly highlighted.\n    if (this._state.highlightAll) {\n      this._updatePage(pageIndex);\n    }\n    if (this._resumePageIdx === pageIndex) {\n      this._resumePageIdx = null;\n      this._nextPageMatch();\n    }\n\n    // Update the match count.\n    const pageMatchesCount = this._pageMatches[pageIndex].length;\n    if (pageMatchesCount > 0) {\n      this._matchesCountTotal += pageMatchesCount;\n      this._updateUIResultsCount();\n    }\n  }\n\n  _extractText() {\n    // Perform text extraction once if this method is called multiple times.\n    if (this._extractTextPromises.length > 0) {\n      return;\n    }\n\n    let promise = Promise.resolve();\n    for (let i = 0, ii = this._linkService.pagesCount; i < ii; i++) {\n      const extractTextCapability = createPromiseCapability();\n      this._extractTextPromises[i] = extractTextCapability.promise;\n\n      promise = promise.then(() => {\n        return this._pdfDocument.getPage(i + 1).then((pdfPage) => {\n          return pdfPage.getTextContent({\n            normalizeWhitespace: true,\n          });\n        }).then((textContent) => {\n          const textItems = textContent.items;\n          const strBuf = [];\n\n          for (let j = 0, jj = textItems.length; j < jj; j++) {\n            strBuf.push(textItems[j].str);\n          }\n\n          // Store the normalized page content (text items) as one string.\n          this._pageContents[i] = normalize(strBuf.join(''));\n          extractTextCapability.resolve(i);\n        }, (reason) => {\n          console.error(`Unable to get text content for page ${i + 1}`, reason);\n          // Page error -- assuming no text content.\n          this._pageContents[i] = '';\n          extractTextCapability.resolve(i);\n        });\n      });\n    }\n  }\n\n  _updatePage(index) {\n    if (this._scrollMatches && this._selected.pageIdx === index) {\n      // If the page is selected, scroll the page into view, which triggers\n      // rendering the page, which adds the text layer. Once the text layer\n      // is built, it will attempt to scroll the selected match into view.\n      this._linkService.page = index + 1;\n    }\n\n    this._eventBus.dispatch('updatetextlayermatches', {\n      source: this,\n      pageIndex: index,\n    });\n  }\n\n  _updateAllPages() {\n    this._eventBus.dispatch('updatetextlayermatches', {\n      source: this,\n      pageIndex: -1,\n    });\n  }\n\n  _nextMatch() {\n    const previous = this._state.findPrevious;\n    const currentPageIndex = this._linkService.page - 1;\n    const numPages = this._linkService.pagesCount;\n\n    this._highlightMatches = true;\n\n    if (this._dirtyMatch) {\n      // Need to recalculate the matches, reset everything.\n      this._dirtyMatch = false;\n      this._selected.pageIdx = this._selected.matchIdx = -1;\n      this._offset.pageIdx = currentPageIndex;\n      this._offset.matchIdx = null;\n      this._offset.wrapped = false;\n      this._resumePageIdx = null;\n      this._pageMatches.length = 0;\n      this._pageMatchesLength.length = 0;\n      this._matchesCountTotal = 0;\n\n      this._updateAllPages(); // Wipe out any previously highlighted matches.\n\n      for (let i = 0; i < numPages; i++) {\n        // Start finding the matches as soon as the text is extracted.\n        if (this._pendingFindMatches[i] === true) {\n          continue;\n        }\n        this._pendingFindMatches[i] = true;\n        this._extractTextPromises[i].then((pageIdx) => {\n          delete this._pendingFindMatches[pageIdx];\n          this._calculateMatch(pageIdx);\n        });\n      }\n    }\n\n    // If there's no query there's no point in searching.\n    if (this._query === '') {\n      this._updateUIState(FindState.FOUND);\n      return;\n    }\n    // If we're waiting on a page, we return since we can't do anything else.\n    if (this._resumePageIdx) {\n      return;\n    }\n\n    const offset = this._offset;\n    // Keep track of how many pages we should maximally iterate through.\n    this._pagesToSearch = numPages;\n    // If there's already a `matchIdx` that means we are iterating through a\n    // page's matches.\n    if (offset.matchIdx !== null) {\n      const numPageMatches = this._pageMatches[offset.pageIdx].length;\n      if ((!previous && offset.matchIdx + 1 < numPageMatches) ||\n          (previous && offset.matchIdx > 0)) {\n        // The simple case; we just have advance the matchIdx to select\n        // the next match on the page.\n        offset.matchIdx = (previous ? offset.matchIdx - 1 :\n                                      offset.matchIdx + 1);\n        this._updateMatch(/* found = */ true);\n        return;\n      }\n      // We went beyond the current page's matches, so we advance to\n      // the next page.\n      this._advanceOffsetPage(previous);\n    }\n    // Start searching through the page.\n    this._nextPageMatch();\n  }\n\n  _matchesReady(matches) {\n    const offset = this._offset;\n    const numMatches = matches.length;\n    const previous = this._state.findPrevious;\n\n    if (numMatches) {\n      // There were matches for the page, so initialize `matchIdx`.\n      offset.matchIdx = (previous ? numMatches - 1 : 0);\n      this._updateMatch(/* found = */ true);\n      return true;\n    }\n    // No matches, so attempt to search the next page.\n    this._advanceOffsetPage(previous);\n    if (offset.wrapped) {\n      offset.matchIdx = null;\n      if (this._pagesToSearch < 0) {\n        // No point in wrapping again, there were no matches.\n        this._updateMatch(/* found = */ false);\n        // While matches were not found, searching for a page\n        // with matches should nevertheless halt.\n        return true;\n      }\n    }\n    // Matches were not found (and searching is not done).\n    return false;\n  }\n\n  _nextPageMatch() {\n    if (this._resumePageIdx !== null) {\n      console.error('There can only be one pending page.');\n    }\n\n    let matches = null;\n    do {\n      const pageIdx = this._offset.pageIdx;\n      matches = this._pageMatches[pageIdx];\n      if (!matches) {\n        // The matches don't exist yet for processing by `_matchesReady`,\n        // so set a resume point for when they do exist.\n        this._resumePageIdx = pageIdx;\n        break;\n      }\n    } while (!this._matchesReady(matches));\n  }\n\n  _advanceOffsetPage(previous) {\n    const offset = this._offset;\n    const numPages = this._linkService.pagesCount;\n    offset.pageIdx = (previous ? offset.pageIdx - 1 : offset.pageIdx + 1);\n    offset.matchIdx = null;\n\n    this._pagesToSearch--;\n\n    if (offset.pageIdx >= numPages || offset.pageIdx < 0) {\n      offset.pageIdx = (previous ? numPages - 1 : 0);\n      offset.wrapped = true;\n    }\n  }\n\n  _updateMatch(found = false) {\n    let state = FindState.NOT_FOUND;\n    const wrapped = this._offset.wrapped;\n    this._offset.wrapped = false;\n\n    if (found) {\n      const previousPage = this._selected.pageIdx;\n      this._selected.pageIdx = this._offset.pageIdx;\n      this._selected.matchIdx = this._offset.matchIdx;\n      state = (wrapped ? FindState.WRAPPED : FindState.FOUND);\n\n      // Update the currently selected page to wipe out any selected matches.\n      if (previousPage !== -1 && previousPage !== this._selected.pageIdx) {\n        this._updatePage(previousPage);\n      }\n    }\n\n    this._updateUIState(state, this._state.findPrevious);\n    if (this._selected.pageIdx !== -1) {\n      // Ensure that the match will be scrolled into view.\n      this._scrollMatches = true;\n\n      this._updatePage(this._selected.pageIdx);\n    }\n  }\n\n  _onFindBarClose(evt) {\n    const pdfDocument = this._pdfDocument;\n    // Since searching is asynchronous, ensure that the removal of highlighted\n    // matches (from the UI) is async too such that the 'updatetextlayermatches'\n    // events will always be dispatched in the expected order.\n    this._firstPageCapability.promise.then(() => {\n      // Only update the UI if the document is open, and is the current one.\n      if (!this._pdfDocument ||\n          (pdfDocument && this._pdfDocument !== pdfDocument)) {\n        return;\n      }\n      // Ensure that a pending, not yet started, search operation is aborted.\n      if (this._findTimeout) {\n        clearTimeout(this._findTimeout);\n        this._findTimeout = null;\n      }\n      // Abort any long running searches, to avoid a match being scrolled into\n      // view *after* the findbar has been closed. In this case `this._offset`\n      // will most likely differ from `this._selected`, hence we also ensure\n      // that any new search operation will always start with a clean slate.\n      if (this._resumePageIdx) {\n        this._resumePageIdx = null;\n        this._dirtyMatch = true;\n      }\n      // Avoid the UI being in a pending state when the findbar is re-opened.\n      this._updateUIState(FindState.FOUND);\n\n      this._highlightMatches = false;\n      this._updateAllPages(); // Wipe out any previously highlighted matches.\n    });\n  }\n\n  _requestMatchesCount() {\n    const { pageIdx, matchIdx, } = this._selected;\n    let current = 0, total = this._matchesCountTotal;\n    if (matchIdx !== -1) {\n      for (let i = 0; i < pageIdx; i++) {\n        current += (this._pageMatches[i] && this._pageMatches[i].length) || 0;\n      }\n      current += matchIdx + 1;\n    }\n    // When searching starts, this method may be called before the `pageMatches`\n    // have been counted (in `_calculateMatch`). Ensure that the UI won't show\n    // temporarily broken state when the active find result doesn't make sense.\n    if (current < 1 || current > total) {\n      current = total = 0;\n    }\n    return { current, total, };\n  }\n\n  _updateUIResultsCount() {\n    this._eventBus.dispatch('updatefindmatchescount', {\n      source: this,\n      matchesCount: this._requestMatchesCount(),\n    });\n  }\n\n  _updateUIState(state, previous) {\n    this._eventBus.dispatch('updatefindcontrolstate', {\n      source: this,\n      state,\n      previous,\n      matchesCount: this._requestMatchesCount(),\n    });\n  }\n}\n\nexport {\n  FindState,\n  PDFFindController,\n};\n","/* Copyright 2018 Mozilla Foundation\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *     http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nconst CharacterType = {\n  SPACE: 0,\n  ALPHA_LETTER: 1,\n  PUNCT: 2,\n  HAN_LETTER: 3,\n  KATAKANA_LETTER: 4,\n  HIRAGANA_LETTER: 5,\n  HALFWIDTH_KATAKANA_LETTER: 6,\n  THAI_LETTER: 7,\n};\n\nfunction isAlphabeticalScript(charCode) {\n  return charCode < 0x2E80;\n}\n\nfunction isAscii(charCode) {\n  return (charCode & 0xFF80) === 0;\n}\n\nfunction isAsciiAlpha(charCode) {\n  return (charCode >= /* a = */ 0x61 && charCode <= /* z = */ 0x7A) ||\n         (charCode >= /* A = */ 0x41 && charCode <= /* Z = */ 0x5A);\n}\n\nfunction isAsciiDigit(charCode) {\n  return (charCode >= /* 0 = */ 0x30 && charCode <= /* 9 = */ 0x39);\n}\n\nfunction isAsciiSpace(charCode) {\n  return (charCode === /* SPACE = */ 0x20 || charCode === /* TAB = */ 0x09 ||\n          charCode === /* CR = */ 0x0D || charCode === /* LF = */ 0x0A);\n}\n\nfunction isHan(charCode) {\n  return (charCode >= 0x3400 && charCode <= 0x9FFF) ||\n         (charCode >= 0xF900 && charCode <= 0xFAFF);\n}\n\nfunction isKatakana(charCode) {\n  return (charCode >= 0x30A0 && charCode <= 0x30FF);\n}\n\nfunction isHiragana(charCode) {\n  return (charCode >= 0x3040 && charCode <= 0x309F);\n}\n\nfunction isHalfwidthKatakana(charCode) {\n  return (charCode >= 0xFF60 && charCode <= 0xFF9F);\n}\n\nfunction isThai(charCode) {\n  return (charCode & 0xFF80) === 0x0E00;\n}\n\n/**\n * This function is based on the word-break detection implemented in:\n * https://hg.mozilla.org/mozilla-central/file/tip/intl/lwbrk/WordBreaker.cpp\n */\nfunction getCharacterType(charCode) {\n  if (isAlphabeticalScript(charCode)) {\n    if (isAscii(charCode)) {\n      if (isAsciiSpace(charCode)) {\n        return CharacterType.SPACE;\n      } else if (isAsciiAlpha(charCode) || isAsciiDigit(charCode) ||\n                 charCode === /* UNDERSCORE = */ 0x5F) {\n        return CharacterType.ALPHA_LETTER;\n      }\n      return CharacterType.PUNCT;\n    } else if (isThai(charCode)) {\n      return CharacterType.THAI_LETTER;\n    } else if (charCode === /* NBSP = */ 0xA0) {\n      return CharacterType.SPACE;\n    }\n    return CharacterType.ALPHA_LETTER;\n  }\n\n  if (isHan(charCode)) {\n    return CharacterType.HAN_LETTER;\n  } else if (isKatakana(charCode)) {\n    return CharacterType.KATAKANA_LETTER;\n  } else if (isHiragana(charCode)) {\n    return CharacterType.HIRAGANA_LETTER;\n  } else if (isHalfwidthKatakana(charCode)) {\n    return CharacterType.HALFWIDTH_KATAKANA_LETTER;\n  }\n  return CharacterType.ALPHA_LETTER;\n}\n\nexport {\n  CharacterType,\n  getCharacterType,\n};\n","/* Copyright 2017 Mozilla Foundation\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *     http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport {\n  getGlobalEventBus, isValidRotation, parseQueryString, waitOnEventOrTimeout\n} from './ui_utils';\n\n// Heuristic value used when force-resetting `this._blockHashChange`.\nconst HASH_CHANGE_TIMEOUT = 1000; // milliseconds\n// Heuristic value used when adding the current position to the browser history.\nconst POSITION_UPDATED_THRESHOLD = 50;\n// Heuristic value used when adding a temporary position to the browser history.\nconst UPDATE_VIEWAREA_TIMEOUT = 1000; // milliseconds\n\n/**\n * @typedef {Object} PDFHistoryOptions\n * @property {IPDFLinkService} linkService - The navigation/linking service.\n * @property {EventBus} eventBus - The application event bus.\n */\n\n/**\n * @typedef {Object} InitializeParameters\n * @property {string} fingerprint - The PDF document's unique fingerprint.\n * @property {boolean} resetHistory - (optional) Reset the browsing history.\n * @property {boolean} updateUrl - (optional) Attempt to update the document\n *   URL, with the current hash, when pushing/replacing browser history entries.\n */\n\n/**\n * @typedef {Object} PushParameters\n * @property {string} namedDest - (optional) The named destination. If absent,\n *   a stringified version of `explicitDest` is used.\n * @property {Array} explicitDest - The explicit destination array.\n * @property {number} pageNumber - The page to which the destination points.\n */\n\nfunction getCurrentHash() {\n  return document.location.hash;\n}\n\nfunction parseCurrentHash(linkService) {\n  let hash = unescape(getCurrentHash()).substring(1);\n  let params = parseQueryString(hash);\n\n  let page = params.page | 0;\n  if (!(Number.isInteger(page) && page > 0 && page <= linkService.pagesCount)) {\n    page = null;\n  }\n  return { hash, page, rotation: linkService.rotation, };\n}\n\nclass PDFHistory {\n  /**\n   * @param {PDFHistoryOptions} options\n   */\n  constructor({ linkService, eventBus, }) {\n    this.linkService = linkService;\n    this.eventBus = eventBus || getGlobalEventBus();\n\n    this.initialized = false;\n    this.initialBookmark = null;\n    this.initialRotation = null;\n\n    this._boundEvents = Object.create(null);\n    this._isViewerInPresentationMode = false;\n    this._isPagesLoaded = false;\n\n    // Ensure that we don't miss either a 'presentationmodechanged' or a\n    // 'pagesloaded' event, by registering the listeners immediately.\n    this.eventBus.on('presentationmodechanged', (evt) => {\n      this._isViewerInPresentationMode = evt.active || evt.switchInProgress;\n    });\n    this.eventBus.on('pagesloaded', (evt) => {\n      this._isPagesLoaded = !!evt.pagesCount;\n    });\n  }\n\n  /**\n   * Initialize the history for the PDF document, using either the current\n   * browser history entry or the document hash, whichever is present.\n   * @param {InitializeParameters} params\n   */\n  initialize({ fingerprint, resetHistory = false, updateUrl = false, }) {\n    if (!fingerprint || typeof fingerprint !== 'string') {\n      console.error(\n        'PDFHistory.initialize: The \"fingerprint\" must be a non-empty string.');\n      return;\n    }\n    let reInitialized = this.initialized && this.fingerprint !== fingerprint;\n    this.fingerprint = fingerprint;\n    this._updateUrl = (updateUrl === true);\n\n    if (!this.initialized) {\n      this._bindEvents();\n    }\n    let state = window.history.state;\n\n    this.initialized = true;\n    this.initialBookmark = null;\n    this.initialRotation = null;\n\n    this._popStateInProgress = false;\n    this._blockHashChange = 0;\n    this._currentHash = getCurrentHash();\n    this._numPositionUpdates = 0;\n\n    this._uid = this._maxUid = 0;\n    this._destination = null;\n    this._position = null;\n\n    if (!this._isValidState(state, /* checkReload = */ true) || resetHistory) {\n      let { hash, page, rotation, } = parseCurrentHash(this.linkService);\n\n      if (!hash || reInitialized || resetHistory) {\n        // Ensure that the browser history is reset on PDF document load.\n        this._pushOrReplaceState(null, /* forceReplace = */ true);\n        return;\n      }\n      // Ensure that the browser history is initialized correctly when\n      // the document hash is present on PDF document load.\n      this._pushOrReplaceState({ hash, page, rotation, },\n                               /* forceReplace = */ true);\n      return;\n    }\n\n    // The browser history contains a valid entry, ensure that the history is\n    // initialized correctly on PDF document load.\n    let destination = state.destination;\n    this._updateInternalState(destination, state.uid,\n                              /* removeTemporary = */ true);\n    if (this._uid > this._maxUid) {\n      this._maxUid = this._uid;\n    }\n\n    if (destination.rotation !== undefined) {\n      this.initialRotation = destination.rotation;\n    }\n    if (destination.dest) {\n      this.initialBookmark = JSON.stringify(destination.dest);\n\n      // If the history is updated, e.g. through the user changing the hash,\n      // before the initial destination has become visible, then we do *not*\n      // want to potentially add `this._position` to the browser history.\n      this._destination.page = null;\n    } else if (destination.hash) {\n      this.initialBookmark = destination.hash;\n    } else if (destination.page) {\n      // Fallback case; shouldn't be necessary, but better safe than sorry.\n      this.initialBookmark = `page=${destination.page}`;\n    }\n  }\n\n  /**\n   * Push an internal destination to the browser history.\n   * @param {PushParameters}\n   */\n  push({ namedDest = null, explicitDest, pageNumber, }) {\n    if (!this.initialized) {\n      return;\n    }\n    if (namedDest && typeof namedDest !== 'string') {\n      console.error('PDFHistory.push: ' +\n                    `\"${namedDest}\" is not a valid namedDest parameter.`);\n      return;\n    } else if (!Array.isArray(explicitDest)) {\n      console.error('PDFHistory.push: ' +\n                    `\"${explicitDest}\" is not a valid explicitDest parameter.`);\n      return;\n    } else if (!(Number.isInteger(pageNumber) &&\n                 pageNumber > 0 && pageNumber <= this.linkService.pagesCount)) {\n      // Allow an unset `pageNumber` if and only if the history is still empty;\n      // please refer to the `this._destination.page = null;` comment above.\n      if (pageNumber !== null || this._destination) {\n        console.error('PDFHistory.push: ' +\n                      `\"${pageNumber}\" is not a valid pageNumber parameter.`);\n        return;\n      }\n    }\n\n    let hash = namedDest || JSON.stringify(explicitDest);\n    if (!hash) {\n      // The hash *should* never be undefined, but if that were to occur,\n      // avoid any possible issues by not updating the browser history.\n      return;\n    }\n\n    let forceReplace = false;\n    if (this._destination &&\n        (isDestHashesEqual(this._destination.hash, hash) ||\n         isDestArraysEqual(this._destination.dest, explicitDest))) {\n      // When the new destination is identical to `this._destination`, and\n      // its `page` is undefined, replace the current browser history entry.\n      // NOTE: This can only occur if `this._destination` was set either:\n      //  - through the document hash being specified on load.\n      //  - through the user changing the hash of the document.\n      if (this._destination.page) {\n        return;\n      }\n      forceReplace = true;\n    }\n    if (this._popStateInProgress && !forceReplace) {\n      return;\n    }\n\n    this._pushOrReplaceState({\n      dest: explicitDest,\n      hash,\n      page: pageNumber,\n      rotation: this.linkService.rotation,\n    }, forceReplace);\n\n    if (!this._popStateInProgress) {\n      // Prevent the browser history from updating while the new destination is\n      // being scrolled into view, to avoid potentially inconsistent state.\n      this._popStateInProgress = true;\n      // We defer the resetting of `this._popStateInProgress`, to account for\n      // e.g. zooming occuring when the new destination is being navigated to.\n      Promise.resolve().then(() => {\n        this._popStateInProgress = false;\n      });\n    }\n  }\n\n  /**\n   * Push the current position to the browser history.\n   */\n  pushCurrentPosition() {\n    if (!this.initialized || this._popStateInProgress) {\n      return;\n    }\n    this._tryPushCurrentPosition();\n  }\n\n  /**\n   * Go back one step in the browser history.\n   * NOTE: Avoids navigating away from the document, useful for \"named actions\".\n   */\n  back() {\n    if (!this.initialized || this._popStateInProgress) {\n      return;\n    }\n    let state = window.history.state;\n    if (this._isValidState(state) && state.uid > 0) {\n      window.history.back();\n    }\n  }\n\n  /**\n   * Go forward one step in the browser history.\n   * NOTE: Avoids navigating away from the document, useful for \"named actions\".\n   */\n  forward() {\n    if (!this.initialized || this._popStateInProgress) {\n      return;\n    }\n    let state = window.history.state;\n    if (this._isValidState(state) && state.uid < this._maxUid) {\n      window.history.forward();\n    }\n  }\n\n  /**\n   * @returns {boolean} Indicating if the user is currently moving through the\n   *   browser history, useful e.g. for skipping the next 'hashchange' event.\n   */\n  get popStateInProgress() {\n    return this.initialized &&\n           (this._popStateInProgress || this._blockHashChange > 0);\n  }\n\n  /**\n   * @private\n   */\n  _pushOrReplaceState(destination, forceReplace = false) {\n    let shouldReplace = forceReplace || !this._destination;\n    let newState = {\n      fingerprint: this.fingerprint,\n      uid: shouldReplace ? this._uid : (this._uid + 1),\n      destination,\n    };\n\n    if (typeof PDFJSDev !== 'undefined' && PDFJSDev.test('CHROME') &&\n        window.history.state && window.history.state.chromecomState) {\n      // history.state.chromecomState is managed by chromecom.js.\n      newState.chromecomState = window.history.state.chromecomState;\n    }\n    this._updateInternalState(destination, newState.uid);\n\n    let newUrl;\n    if (this._updateUrl && destination && destination.hash) {\n      const baseUrl = document.location.href.split('#')[0];\n      if (!baseUrl.startsWith('file://')) { // Prevent errors in Firefox.\n        newUrl = `${baseUrl}#${destination.hash}`;\n      }\n    }\n    if (shouldReplace) {\n      if (newUrl) {\n        window.history.replaceState(newState, '', newUrl);\n      } else {\n        window.history.replaceState(newState, '');\n      }\n    } else {\n      this._maxUid = this._uid;\n      if (newUrl) {\n        window.history.pushState(newState, '', newUrl);\n      } else {\n        window.history.pushState(newState, '');\n      }\n    }\n\n    if (typeof PDFJSDev !== 'undefined' && PDFJSDev.test('CHROME') &&\n        top === window) {\n      // eslint-disable-next-line no-undef\n      chrome.runtime.sendMessage('showPageAction');\n    }\n  }\n\n  /**\n   * @private\n   */\n  _tryPushCurrentPosition(temporary = false) {\n    if (!this._position) {\n      return;\n    }\n    let position = this._position;\n    if (temporary) {\n      position = Object.assign(Object.create(null), this._position);\n      position.temporary = true;\n    }\n\n    if (!this._destination) {\n      this._pushOrReplaceState(position);\n      return;\n    }\n    if (this._destination.temporary) {\n      // Always replace a previous *temporary* position.\n      this._pushOrReplaceState(position, /* forceReplace = */ true);\n      return;\n    }\n    if (this._destination.hash === position.hash) {\n      return; // The current document position has not changed.\n    }\n    if (!this._destination.page &&\n        (POSITION_UPDATED_THRESHOLD <= 0 ||\n         this._numPositionUpdates <= POSITION_UPDATED_THRESHOLD)) {\n      // `this._destination` was set through the user changing the hash of\n      // the document. Do not add `this._position` to the browser history,\n      // to avoid \"flooding\" it with lots of (nearly) identical entries,\n      // since we cannot ensure that the document position has changed.\n      return;\n    }\n\n    let forceReplace = false;\n    if (this._destination.page >= position.first &&\n        this._destination.page <= position.page) {\n      // When the `page` of `this._destination` is still visible, do not\n      // update the browsing history when `this._destination` either:\n      //  - contains an internal destination, since in this case we\n      //    cannot ensure that the document position has actually changed.\n      //  - was set through the user changing the hash of the document.\n      if (this._destination.dest || !this._destination.first) {\n        return;\n      }\n      // To avoid \"flooding\" the browser history, replace the current entry.\n      forceReplace = true;\n    }\n    this._pushOrReplaceState(position, forceReplace);\n  }\n\n  /**\n   * @private\n   */\n  _isValidState(state, checkReload = false) {\n    if (!state) {\n      return false;\n    }\n    if (state.fingerprint !== this.fingerprint) {\n      if (checkReload) {\n        // Potentially accept the history entry, even if the fingerprints don't\n        // match, when the viewer was reloaded (see issue 6847).\n        if (typeof state.fingerprint !== 'string' ||\n            state.fingerprint.length !== this.fingerprint.length) {\n          return false;\n        }\n        const [perfEntry] = performance.getEntriesByType('navigation');\n        if (!perfEntry || perfEntry.type !== 'reload') {\n          return false;\n        }\n      } else {\n        // This should only occur in viewers with support for opening more than\n        // one PDF document, e.g. the GENERIC viewer.\n        return false;\n      }\n    }\n    if (!Number.isInteger(state.uid) || state.uid < 0) {\n      return false;\n    }\n    if (state.destination === null || typeof state.destination !== 'object') {\n      return false;\n    }\n    return true;\n  }\n\n  /**\n   * @private\n   */\n  _updateInternalState(destination, uid, removeTemporary = false) {\n    if (this._updateViewareaTimeout) {\n      // When updating `this._destination`, make sure that we always wait for\n      // the next 'updateviewarea' event before (potentially) attempting to\n      // push the current position to the browser history.\n      clearTimeout(this._updateViewareaTimeout);\n      this._updateViewareaTimeout = null;\n    }\n    if (removeTemporary && destination && destination.temporary) {\n      // When the `destination` comes from the browser history,\n      // we no longer treat it as a *temporary* position.\n      delete destination.temporary;\n    }\n    this._destination = destination;\n    this._uid = uid;\n    // This should always be reset when `this._destination` is updated.\n    this._numPositionUpdates = 0;\n  }\n\n  /**\n   * @private\n   */\n  _updateViewarea({ location, }) {\n    if (this._updateViewareaTimeout) {\n      clearTimeout(this._updateViewareaTimeout);\n      this._updateViewareaTimeout = null;\n    }\n\n    this._position = {\n      hash: this._isViewerInPresentationMode ?\n        `page=${location.pageNumber}` : location.pdfOpenParams.substring(1),\n      page: this.linkService.page,\n      first: location.pageNumber,\n      rotation: location.rotation,\n    };\n\n    if (this._popStateInProgress) {\n      return;\n    }\n\n    if (POSITION_UPDATED_THRESHOLD > 0 && this._isPagesLoaded &&\n        this._destination && !this._destination.page) {\n      // If the current destination was set through the user changing the hash\n      // of the document, we will usually not try to push the current position\n      // to the browser history; see `this._tryPushCurrentPosition()`.\n      //\n      // To prevent `this._tryPushCurrentPosition()` from effectively being\n      // reduced to a no-op in this case, we will assume that the position\n      // *did* in fact change if the 'updateviewarea' event was dispatched\n      // more than `POSITION_UPDATED_THRESHOLD` times.\n      this._numPositionUpdates++;\n    }\n\n    if (UPDATE_VIEWAREA_TIMEOUT > 0) {\n      // When closing the browser, a 'pagehide' event will be dispatched which\n      // *should* allow us to push the current position to the browser history.\n      // In practice, it seems that the event is arriving too late in order for\n      // the session history to be successfully updated.\n      // (For additional details, please refer to the discussion in\n      //  https://bugzilla.mozilla.org/show_bug.cgi?id=1153393.)\n      //\n      // To workaround this we attempt to *temporarily* add the current position\n      // to the browser history only when the viewer is *idle*,\n      // i.e. when scrolling and/or zooming does not occur.\n      //\n      // PLEASE NOTE: It's absolutely imperative that the browser history is\n      // *not* updated too often, since that would render the viewer more or\n      // less unusable. Hence the use of a timeout to delay the update until\n      // the viewer has been idle for `UPDATE_VIEWAREA_TIMEOUT` milliseconds.\n      this._updateViewareaTimeout = setTimeout(() => {\n        if (!this._popStateInProgress) {\n          this._tryPushCurrentPosition(/* temporary = */ true);\n        }\n        this._updateViewareaTimeout = null;\n      }, UPDATE_VIEWAREA_TIMEOUT);\n    }\n  }\n\n  /**\n   * @private\n   */\n  _popState({ state, }) {\n    let newHash = getCurrentHash(), hashChanged = this._currentHash !== newHash;\n    this._currentHash = newHash;\n\n    if (!state ||\n        (typeof PDFJSDev !== 'undefined' && PDFJSDev.test('CHROME') &&\n         state.chromecomState && !this._isValidState(state))) {\n      // This case corresponds to the user changing the hash of the document.\n      this._uid++;\n\n      let { hash, page, rotation, } = parseCurrentHash(this.linkService);\n      this._pushOrReplaceState({ hash, page, rotation, },\n                               /* forceReplace = */ true);\n      return;\n    }\n    if (!this._isValidState(state)) {\n      // This should only occur in viewers with support for opening more than\n      // one PDF document, e.g. the GENERIC viewer.\n      return;\n    }\n\n    // Prevent the browser history from updating until the new destination,\n    // as stored in the browser history, has been scrolled into view.\n    this._popStateInProgress = true;\n\n    if (hashChanged) {\n      // When the hash changed, implying that the 'popstate' event will be\n      // followed by a 'hashchange' event, then we do *not* want to update the\n      // browser history when handling the 'hashchange' event (in web/app.js)\n      // since that would *overwrite* the new destination navigated to below.\n      //\n      // To avoid accidentally disabling all future user-initiated hash changes,\n      // if there's e.g. another 'hashchange' listener that stops the event\n      // propagation, we make sure to always force-reset `this._blockHashChange`\n      // after `HASH_CHANGE_TIMEOUT` milliseconds have passed.\n      this._blockHashChange++;\n      waitOnEventOrTimeout({\n        target: window,\n        name: 'hashchange',\n        delay: HASH_CHANGE_TIMEOUT,\n      }).then(() => {\n        this._blockHashChange--;\n      });\n    }\n\n    // Navigate to the new destination.\n    let destination = state.destination;\n    this._updateInternalState(destination, state.uid,\n                              /* removeTemporary = */ true);\n    if (this._uid > this._maxUid) {\n      this._maxUid = this._uid;\n    }\n\n    if (isValidRotation(destination.rotation)) {\n      this.linkService.rotation = destination.rotation;\n    }\n    if (destination.dest) {\n      this.linkService.navigateTo(destination.dest);\n    } else if (destination.hash) {\n      this.linkService.setHash(destination.hash);\n    } else if (destination.page) {\n      // Fallback case; shouldn't be necessary, but better safe than sorry.\n      this.linkService.page = destination.page;\n    }\n\n    // Since `PDFLinkService.navigateTo` is asynchronous, we thus defer the\n    // resetting of `this._popStateInProgress` slightly.\n    Promise.resolve().then(() => {\n      this._popStateInProgress = false;\n    });\n  }\n\n  /**\n   * @private\n   */\n  _bindEvents() {\n    let { _boundEvents, eventBus, } = this;\n\n    _boundEvents.updateViewarea = this._updateViewarea.bind(this);\n    _boundEvents.popState = this._popState.bind(this);\n    _boundEvents.pageHide = (evt) => {\n      // Attempt to push the `this._position` into the browser history when\n      // navigating away from the document. This is *only* done if the history\n      // is empty/temporary, since otherwise an existing browser history entry\n      // will end up being overwritten (given that new entries cannot be pushed\n      // into the browser history when the 'unload' event has already fired).\n      if (!this._destination || this._destination.temporary) {\n        this._tryPushCurrentPosition();\n      }\n    };\n\n    eventBus.on('updateviewarea', _boundEvents.updateViewarea);\n    window.addEventListener('popstate', _boundEvents.popState);\n    window.addEventListener('pagehide', _boundEvents.pageHide);\n  }\n}\n\nfunction isDestHashesEqual(destHash, pushHash) {\n  if (typeof destHash !== 'string' || typeof pushHash !== 'string') {\n    return false;\n  }\n  if (destHash === pushHash) {\n    return true;\n  }\n  let { nameddest, } = parseQueryString(destHash);\n  if (nameddest === pushHash) {\n    return true;\n  }\n  return false;\n}\n\nfunction isDestArraysEqual(firstDest, secondDest) {\n  function isEntryEqual(first, second) {\n    if (typeof first !== typeof second) {\n      return false;\n    }\n    if (Array.isArray(first) || Array.isArray(second)) {\n      return false;\n    }\n    if (first !== null && typeof first === 'object' && second !== null) {\n      if (Object.keys(first).length !== Object.keys(second).length) {\n        return false;\n      }\n      for (let key in first) {\n        if (!isEntryEqual(first[key], second[key])) {\n          return false;\n        }\n      }\n      return true;\n    }\n    return first === second || (Number.isNaN(first) && Number.isNaN(second));\n  }\n\n  if (!(Array.isArray(firstDest) && Array.isArray(secondDest))) {\n    return false;\n  }\n  if (firstDest.length !== secondDest.length) {\n    return false;\n  }\n  for (let i = 0, ii = firstDest.length; i < ii; i++) {\n    if (!isEntryEqual(firstDest[i], secondDest[i])) {\n      return false;\n    }\n  }\n  return true;\n}\n\nexport {\n  PDFHistory,\n  isDestHashesEqual,\n  isDestArraysEqual,\n};\n","/* Copyright 2012 Mozilla Foundation\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *     http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport {\n  approximateFraction, CSS_UNITS, DEFAULT_SCALE, getGlobalEventBus,\n  getOutputScale, NullL10n, RendererType, roundToDivide, TextLayerMode\n} from './ui_utils';\nimport {\n  createPromiseCapability, RenderingCancelledException, SVGGraphics\n} from 'pdfjs-lib';\nimport { RenderingStates } from './pdf_rendering_queue';\nimport { viewerCompatibilityParams } from './viewer_compatibility';\n\n/**\n * @typedef {Object} PDFPageViewOptions\n * @property {HTMLDivElement} container - The viewer element.\n * @property {EventBus} eventBus - The application event bus.\n * @property {number} id - The page unique ID (normally its number).\n * @property {number} scale - The page scale display.\n * @property {PageViewport} defaultViewport - The page viewport.\n * @property {PDFRenderingQueue} renderingQueue - The rendering queue object.\n * @property {IPDFTextLayerFactory} textLayerFactory\n * @property {number} textLayerMode - (optional) Controls if the text layer used\n *   for selection and searching is created, and if the improved text selection\n *   behaviour is enabled. The constants from {TextLayerMode} should be used.\n *   The default value is `TextLayerMode.ENABLE`.\n * @property {IPDFAnnotationLayerFactory} annotationLayerFactory\n * @property {string} imageResourcesPath - (optional) Path for image resources,\n *   mainly for annotation icons. Include trailing slash.\n * @property {boolean} renderInteractiveForms - Turns on rendering of\n *   interactive form elements. The default is `false`.\n * @property {string} renderer - 'canvas' or 'svg'. The default is 'canvas'.\n * @property {boolean} enableWebGL - (optional) Enables WebGL accelerated\n *   rendering for some operations. The default value is `false`.\n * @property {boolean} useOnlyCssZoom - (optional) Enables CSS only zooming.\n *   The default value is `false`.\n * @property {number} maxCanvasPixels - (optional) The maximum supported canvas\n *   size in total pixels, i.e. width * height. Use -1 for no limit.\n *   The default value is 4096 * 4096 (16 mega-pixels).\n * @property {IL10n} l10n - Localization service.\n */\n\nconst MAX_CANVAS_PIXELS = viewerCompatibilityParams.maxCanvasPixels || 16777216;\n\n/**\n * @implements {IRenderableView}\n */\nclass PDFPageView {\n  /**\n   * @param {PDFPageViewOptions} options\n   */\n  constructor(options) {\n    let container = options.container;\n    let defaultViewport = options.defaultViewport;\n\n    this.id = options.id;\n    this.renderingId = 'page' + this.id;\n\n    this.pdfPage = null;\n    this.pageLabel = null;\n    this.rotation = 0;\n    this.scale = options.scale || DEFAULT_SCALE;\n    this.viewport = defaultViewport;\n    this.pdfPageRotate = defaultViewport.rotation;\n    this.hasRestrictedScaling = false;\n    this.textLayerMode = Number.isInteger(options.textLayerMode) ?\n      options.textLayerMode : TextLayerMode.ENABLE;\n    this.imageResourcesPath = options.imageResourcesPath || '';\n    this.renderInteractiveForms = options.renderInteractiveForms || false;\n    this.useOnlyCssZoom = options.useOnlyCssZoom || false;\n    this.maxCanvasPixels = options.maxCanvasPixels || MAX_CANVAS_PIXELS;\n\n    this.eventBus = options.eventBus || getGlobalEventBus();\n    this.renderingQueue = options.renderingQueue;\n    this.textLayerFactory = options.textLayerFactory;\n    this.annotationLayerFactory = options.annotationLayerFactory;\n    this.renderer = options.renderer || RendererType.CANVAS;\n    this.enableWebGL = options.enableWebGL || false;\n    this.l10n = options.l10n || NullL10n;\n\n    this.paintTask = null;\n    this.paintedViewportMap = new WeakMap();\n    this.renderingState = RenderingStates.INITIAL;\n    this.resume = null;\n    this.error = null;\n\n    this.onBeforeDraw = null;\n    this.onAfterDraw = null;\n\n    this.annotationLayer = null;\n    this.textLayer = null;\n    this.zoomLayer = null;\n\n    let div = document.createElement('div');\n    div.className = 'page';\n    div.style.width = Math.floor(this.viewport.width) + 'px';\n    div.style.height = Math.floor(this.viewport.height) + 'px';\n    div.setAttribute('data-page-number', this.id);\n    this.div = div;\n\n    container.appendChild(div);\n  }\n\n  setPdfPage(pdfPage) {\n    this.pdfPage = pdfPage;\n    this.pdfPageRotate = pdfPage.rotate;\n\n    let totalRotation = (this.rotation + this.pdfPageRotate) % 360;\n    this.viewport = pdfPage.getViewport({ scale: this.scale * CSS_UNITS,\n                                          rotation: totalRotation, });\n    this.stats = pdfPage.stats;\n    this.reset();\n  }\n\n  destroy() {\n    this.reset();\n    if (this.pdfPage) {\n      this.pdfPage.cleanup();\n    }\n  }\n\n  /**\n   * @private\n   */\n  _resetZoomLayer(removeFromDOM = false) {\n    if (!this.zoomLayer) {\n      return;\n    }\n    let zoomLayerCanvas = this.zoomLayer.firstChild;\n    this.paintedViewportMap.delete(zoomLayerCanvas);\n    // Zeroing the width and height causes Firefox to release graphics\n    // resources immediately, which can greatly reduce memory consumption.\n    zoomLayerCanvas.width = 0;\n    zoomLayerCanvas.height = 0;\n\n    if (removeFromDOM) {\n      // Note: `ChildNode.remove` doesn't throw if the parent node is undefined.\n      this.zoomLayer.remove();\n    }\n    this.zoomLayer = null;\n  }\n\n  reset(keepZoomLayer = false, keepAnnotations = false) {\n    this.cancelRendering(keepAnnotations);\n    this.renderingState = RenderingStates.INITIAL;\n\n    let div = this.div;\n    div.style.width = Math.floor(this.viewport.width) + 'px';\n    div.style.height = Math.floor(this.viewport.height) + 'px';\n\n    let childNodes = div.childNodes;\n    let currentZoomLayerNode = (keepZoomLayer && this.zoomLayer) || null;\n    let currentAnnotationNode = (keepAnnotations && this.annotationLayer &&\n                                 this.annotationLayer.div) || null;\n    for (let i = childNodes.length - 1; i >= 0; i--) {\n      let node = childNodes[i];\n      if (currentZoomLayerNode === node || currentAnnotationNode === node) {\n        continue;\n      }\n      div.removeChild(node);\n    }\n    div.removeAttribute('data-loaded');\n\n    if (currentAnnotationNode) {\n      // Hide the annotation layer until all elements are resized\n      // so they are not displayed on the already resized page.\n      this.annotationLayer.hide();\n    } else if (this.annotationLayer) {\n      this.annotationLayer.cancel();\n      this.annotationLayer = null;\n    }\n\n    if (!currentZoomLayerNode) {\n      if (this.canvas) {\n        this.paintedViewportMap.delete(this.canvas);\n        // Zeroing the width and height causes Firefox to release graphics\n        // resources immediately, which can greatly reduce memory consumption.\n        this.canvas.width = 0;\n        this.canvas.height = 0;\n        delete this.canvas;\n      }\n      this._resetZoomLayer();\n    }\n    if (this.svg) {\n      this.paintedViewportMap.delete(this.svg);\n      delete this.svg;\n    }\n\n    this.loadingIconDiv = document.createElement('div');\n    this.loadingIconDiv.className = 'loadingIcon';\n    div.appendChild(this.loadingIconDiv);\n  }\n\n  update(scale, rotation) {\n    this.scale = scale || this.scale;\n    if (typeof rotation !== 'undefined') { // The rotation may be zero.\n      this.rotation = rotation;\n    }\n\n    let totalRotation = (this.rotation + this.pdfPageRotate) % 360;\n    this.viewport = this.viewport.clone({\n      scale: this.scale * CSS_UNITS,\n      rotation: totalRotation,\n    });\n\n    if (this.svg) {\n      this.cssTransform(this.svg, true);\n\n      this.eventBus.dispatch('pagerendered', {\n        source: this,\n        pageNumber: this.id,\n        cssTransform: true,\n      });\n      return;\n    }\n\n    let isScalingRestricted = false;\n    if (this.canvas && this.maxCanvasPixels > 0) {\n      let outputScale = this.outputScale;\n      if (((Math.floor(this.viewport.width) * outputScale.sx) | 0) *\n          ((Math.floor(this.viewport.height) * outputScale.sy) | 0) >\n          this.maxCanvasPixels) {\n        isScalingRestricted = true;\n      }\n    }\n\n    if (this.canvas) {\n      if (this.useOnlyCssZoom ||\n          (this.hasRestrictedScaling && isScalingRestricted)) {\n        this.cssTransform(this.canvas, true);\n\n        this.eventBus.dispatch('pagerendered', {\n          source: this,\n          pageNumber: this.id,\n          cssTransform: true,\n        });\n        return;\n      }\n      if (!this.zoomLayer && !this.canvas.hasAttribute('hidden')) {\n        this.zoomLayer = this.canvas.parentNode;\n        this.zoomLayer.style.position = 'absolute';\n      }\n    }\n    if (this.zoomLayer) {\n      this.cssTransform(this.zoomLayer.firstChild);\n    }\n    this.reset(/* keepZoomLayer = */ true, /* keepAnnotations = */ true);\n  }\n\n  /**\n   * PLEASE NOTE: Most likely you want to use the `this.reset()` method,\n   *              rather than calling this one directly.\n   */\n  cancelRendering(keepAnnotations = false) {\n    if (this.paintTask) {\n      this.paintTask.cancel();\n      this.paintTask = null;\n    }\n    this.resume = null;\n\n    if (this.textLayer) {\n      this.textLayer.cancel();\n      this.textLayer = null;\n    }\n    if (!keepAnnotations && this.annotationLayer) {\n      this.annotationLayer.cancel();\n      this.annotationLayer = null;\n    }\n  }\n\n  cssTransform(target, redrawAnnotations = false) {\n    // Scale target (canvas or svg), its wrapper and page container.\n    let width = this.viewport.width;\n    let height = this.viewport.height;\n    let div = this.div;\n    target.style.width = target.parentNode.style.width = div.style.width =\n      Math.floor(width) + 'px';\n    target.style.height = target.parentNode.style.height = div.style.height =\n      Math.floor(height) + 'px';\n    // The canvas may have been originally rotated; rotate relative to that.\n    let relativeRotation = this.viewport.rotation -\n                           this.paintedViewportMap.get(target).rotation;\n    let absRotation = Math.abs(relativeRotation);\n    let scaleX = 1, scaleY = 1;\n    if (absRotation === 90 || absRotation === 270) {\n      // Scale x and y because of the rotation.\n      scaleX = height / width;\n      scaleY = width / height;\n    }\n    let cssTransform = 'rotate(' + relativeRotation + 'deg) ' +\n      'scale(' + scaleX + ',' + scaleY + ')';\n    target.style.transform = cssTransform;\n\n    if (this.textLayer) {\n      // Rotating the text layer is more complicated since the divs inside the\n      // the text layer are rotated.\n      // TODO: This could probably be simplified by drawing the text layer in\n      // one orientation and then rotating overall.\n      let textLayerViewport = this.textLayer.viewport;\n      let textRelativeRotation = this.viewport.rotation -\n        textLayerViewport.rotation;\n      let textAbsRotation = Math.abs(textRelativeRotation);\n      let scale = width / textLayerViewport.width;\n      if (textAbsRotation === 90 || textAbsRotation === 270) {\n        scale = width / textLayerViewport.height;\n      }\n      let textLayerDiv = this.textLayer.textLayerDiv;\n      let transX, transY;\n      switch (textAbsRotation) {\n        case 0:\n          transX = transY = 0;\n          break;\n        case 90:\n          transX = 0;\n          transY = '-' + textLayerDiv.style.height;\n          break;\n        case 180:\n          transX = '-' + textLayerDiv.style.width;\n          transY = '-' + textLayerDiv.style.height;\n          break;\n        case 270:\n          transX = '-' + textLayerDiv.style.width;\n          transY = 0;\n          break;\n        default:\n          console.error('Bad rotation value.');\n          break;\n      }\n\n      textLayerDiv.style.transform =\n        'rotate(' + textAbsRotation + 'deg) ' +\n        'scale(' + scale + ', ' + scale + ') ' +\n        'translate(' + transX + ', ' + transY + ')';\n      textLayerDiv.style.transformOrigin = '0% 0%';\n    }\n\n    if (redrawAnnotations && this.annotationLayer) {\n      this.annotationLayer.render(this.viewport, 'display');\n    }\n  }\n\n  get width() {\n    return this.viewport.width;\n  }\n\n  get height() {\n    return this.viewport.height;\n  }\n\n  getPagePoint(x, y) {\n    return this.viewport.convertToPdfPoint(x, y);\n  }\n\n  draw() {\n    if (this.renderingState !== RenderingStates.INITIAL) {\n      console.error('Must be in new state before drawing');\n      this.reset(); // Ensure that we reset all state to prevent issues.\n    }\n\n    if (!this.pdfPage) {\n      this.renderingState = RenderingStates.FINISHED;\n      return Promise.reject(new Error('Page is not loaded'));\n    }\n\n    this.renderingState = RenderingStates.RUNNING;\n\n    let pdfPage = this.pdfPage;\n    let div = this.div;\n    // Wrap the canvas so that if it has a CSS transform for high DPI the\n    // overflow will be hidden in Firefox.\n    let canvasWrapper = document.createElement('div');\n    canvasWrapper.style.width = div.style.width;\n    canvasWrapper.style.height = div.style.height;\n    canvasWrapper.classList.add('canvasWrapper');\n\n    if (this.annotationLayer && this.annotationLayer.div) {\n      // The annotation layer needs to stay on top.\n      div.insertBefore(canvasWrapper, this.annotationLayer.div);\n    } else {\n      div.appendChild(canvasWrapper);\n    }\n\n    let textLayer = null;\n    if (this.textLayerMode !== TextLayerMode.DISABLE && this.textLayerFactory) {\n      let textLayerDiv = document.createElement('div');\n      textLayerDiv.className = 'textLayer';\n      textLayerDiv.style.width = canvasWrapper.style.width;\n      textLayerDiv.style.height = canvasWrapper.style.height;\n      if (this.annotationLayer && this.annotationLayer.div) {\n        // The annotation layer needs to stay on top.\n        div.insertBefore(textLayerDiv, this.annotationLayer.div);\n      } else {\n        div.appendChild(textLayerDiv);\n      }\n\n      textLayer = this.textLayerFactory.\n        createTextLayerBuilder(textLayerDiv, this.id - 1, this.viewport,\n            this.textLayerMode === TextLayerMode.ENABLE_ENHANCE);\n    }\n    this.textLayer = textLayer;\n\n    let renderContinueCallback = null;\n    if (this.renderingQueue) {\n      renderContinueCallback = (cont) => {\n        if (!this.renderingQueue.isHighestPriority(this)) {\n          this.renderingState = RenderingStates.PAUSED;\n          this.resume = () => {\n            this.renderingState = RenderingStates.RUNNING;\n            cont();\n          };\n          return;\n        }\n        cont();\n      };\n    }\n\n    const finishPaintTask = async (error) => {\n      // The paintTask may have been replaced by a new one, so only remove\n      // the reference to the paintTask if it matches the one that is\n      // triggering this callback.\n      if (paintTask === this.paintTask) {\n        this.paintTask = null;\n      }\n\n      if (error instanceof RenderingCancelledException) {\n        this.error = null;\n        return;\n      }\n\n      this.renderingState = RenderingStates.FINISHED;\n\n      if (this.loadingIconDiv) {\n        div.removeChild(this.loadingIconDiv);\n        delete this.loadingIconDiv;\n      }\n      this._resetZoomLayer(/* removeFromDOM = */ true);\n\n      this.error = error;\n      this.stats = pdfPage.stats;\n      if (this.onAfterDraw) {\n        this.onAfterDraw();\n      }\n      this.eventBus.dispatch('pagerendered', {\n        source: this,\n        pageNumber: this.id,\n        cssTransform: false,\n      });\n\n      if (error) {\n        throw error;\n      }\n    };\n\n    let paintTask = this.renderer === RendererType.SVG ?\n      this.paintOnSvg(canvasWrapper) :\n      this.paintOnCanvas(canvasWrapper);\n    paintTask.onRenderContinue = renderContinueCallback;\n    this.paintTask = paintTask;\n\n    let resultPromise = paintTask.promise.then(function() {\n      return finishPaintTask(null).then(function () {\n        if (textLayer) {\n          let readableStream = pdfPage.streamTextContent({\n            normalizeWhitespace: true,\n          });\n          textLayer.setTextContentStream(readableStream);\n          textLayer.render();\n        }\n      });\n    }, function(reason) {\n      return finishPaintTask(reason);\n    });\n\n    if (this.annotationLayerFactory) {\n      if (!this.annotationLayer) {\n        this.annotationLayer = this.annotationLayerFactory.\n          createAnnotationLayerBuilder(div, pdfPage, this.imageResourcesPath,\n                                       this.renderInteractiveForms, this.l10n);\n      }\n      this.annotationLayer.render(this.viewport, 'display');\n    }\n    div.setAttribute('data-loaded', true);\n\n    if (this.onBeforeDraw) {\n      this.onBeforeDraw();\n    }\n    return resultPromise;\n  }\n\n  paintOnCanvas(canvasWrapper) {\n    let renderCapability = createPromiseCapability();\n    let result = {\n      promise: renderCapability.promise,\n      onRenderContinue(cont) {\n        cont();\n      },\n      cancel() {\n        renderTask.cancel();\n      },\n    };\n\n    let viewport = this.viewport;\n    let canvas = document.createElement('canvas');\n    canvas.id = this.renderingId;\n\n    // Keep the canvas hidden until the first draw callback, or until drawing\n    // is complete when `!this.renderingQueue`, to prevent black flickering.\n    canvas.setAttribute('hidden', 'hidden');\n    let isCanvasHidden = true;\n    let showCanvas = function () {\n      if (isCanvasHidden) {\n        canvas.removeAttribute('hidden');\n        isCanvasHidden = false;\n      }\n    };\n\n    canvasWrapper.appendChild(canvas);\n    this.canvas = canvas;\n\n    if (typeof PDFJSDev === 'undefined' ||\n        PDFJSDev.test('MOZCENTRAL || FIREFOX || GENERIC')) {\n      canvas.mozOpaque = true;\n    }\n\n    let ctx = canvas.getContext('2d', { alpha: false, });\n    let outputScale = getOutputScale(ctx);\n    this.outputScale = outputScale;\n\n    if (this.useOnlyCssZoom) {\n      let actualSizeViewport = viewport.clone({ scale: CSS_UNITS, });\n      // Use a scale that makes the canvas have the originally intended size\n      // of the page.\n      outputScale.sx *= actualSizeViewport.width / viewport.width;\n      outputScale.sy *= actualSizeViewport.height / viewport.height;\n      outputScale.scaled = true;\n    }\n\n    if (this.maxCanvasPixels > 0) {\n      let pixelsInViewport = viewport.width * viewport.height;\n      let maxScale = Math.sqrt(this.maxCanvasPixels / pixelsInViewport);\n      if (outputScale.sx > maxScale || outputScale.sy > maxScale) {\n        outputScale.sx = maxScale;\n        outputScale.sy = maxScale;\n        outputScale.scaled = true;\n        this.hasRestrictedScaling = true;\n      } else {\n        this.hasRestrictedScaling = false;\n      }\n    }\n\n    let sfx = approximateFraction(outputScale.sx);\n    let sfy = approximateFraction(outputScale.sy);\n    canvas.width = roundToDivide(viewport.width * outputScale.sx, sfx[0]);\n    canvas.height = roundToDivide(viewport.height * outputScale.sy, sfy[0]);\n    canvas.style.width = roundToDivide(viewport.width, sfx[1]) + 'px';\n    canvas.style.height = roundToDivide(viewport.height, sfy[1]) + 'px';\n    // Add the viewport so it's known what it was originally drawn with.\n    this.paintedViewportMap.set(canvas, viewport);\n\n    // Rendering area\n    let transform = !outputScale.scaled ? null :\n      [outputScale.sx, 0, 0, outputScale.sy, 0, 0];\n    let renderContext = {\n      canvasContext: ctx,\n      transform,\n      viewport: this.viewport,\n      enableWebGL: this.enableWebGL,\n      renderInteractiveForms: this.renderInteractiveForms,\n    };\n    let renderTask = this.pdfPage.render(renderContext);\n    renderTask.onContinue = function (cont) {\n      showCanvas();\n      if (result.onRenderContinue) {\n        result.onRenderContinue(cont);\n      } else {\n        cont();\n      }\n    };\n\n    renderTask.promise.then(function() {\n      showCanvas();\n      renderCapability.resolve(undefined);\n    }, function(error) {\n      showCanvas();\n      renderCapability.reject(error);\n    });\n    return result;\n  }\n\n  paintOnSvg(wrapper) {\n    if (typeof PDFJSDev !== 'undefined' &&\n        PDFJSDev.test('FIREFOX || MOZCENTRAL || CHROME')) {\n      // Return a mock object, to prevent errors such as e.g.\n      // \"TypeError: paintTask.promise is undefined\".\n      return {\n        promise: Promise.reject(new Error('SVG rendering is not supported.')),\n        onRenderContinue(cont) { },\n        cancel() { },\n      };\n    }\n\n    let cancelled = false;\n    let ensureNotCancelled = () => {\n      if (cancelled) {\n        throw new RenderingCancelledException(\n          'Rendering cancelled, page ' + this.id, 'svg');\n      }\n    };\n\n    let pdfPage = this.pdfPage;\n    let actualSizeViewport = this.viewport.clone({ scale: CSS_UNITS, });\n    let promise = pdfPage.getOperatorList().then((opList) => {\n      ensureNotCancelled();\n      let svgGfx = new SVGGraphics(pdfPage.commonObjs, pdfPage.objs);\n      return svgGfx.getSVG(opList, actualSizeViewport).then((svg) => {\n        ensureNotCancelled();\n        this.svg = svg;\n        this.paintedViewportMap.set(svg, actualSizeViewport);\n\n        svg.style.width = wrapper.style.width;\n        svg.style.height = wrapper.style.height;\n        this.renderingState = RenderingStates.FINISHED;\n        wrapper.appendChild(svg);\n      });\n    });\n\n    return {\n      promise,\n      onRenderContinue(cont) {\n        cont();\n      },\n      cancel() {\n        cancelled = true;\n      },\n    };\n  }\n\n  /**\n   * @param {string|null} label\n   */\n  setPageLabel(label) {\n    this.pageLabel = (typeof label === 'string' ? label : null);\n\n    if (this.pageLabel !== null) {\n      this.div.setAttribute('data-page-label', this.pageLabel);\n    } else {\n      this.div.removeAttribute('data-page-label');\n    }\n  }\n}\n\nexport {\n  PDFPageView,\n};\n","/* Copyright 2012 Mozilla Foundation\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *     http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nconst CLEANUP_TIMEOUT = 30000;\n\nconst RenderingStates = {\n  INITIAL: 0,\n  RUNNING: 1,\n  PAUSED: 2,\n  FINISHED: 3,\n};\n\n/**\n * Controls rendering of the views for pages and thumbnails.\n */\nclass PDFRenderingQueue {\n  constructor() {\n    this.pdfViewer = null;\n    this.pdfThumbnailViewer = null;\n    this.onIdle = null;\n    this.highestPriorityPage = null;\n    this.idleTimeout = null;\n    this.printing = false;\n    this.isThumbnailViewEnabled = false;\n  }\n\n  /**\n   * @param {PDFViewer} pdfViewer\n   */\n  setViewer(pdfViewer) {\n    this.pdfViewer = pdfViewer;\n  }\n\n  /**\n   * @param {PDFThumbnailViewer} pdfThumbnailViewer\n   */\n  setThumbnailViewer(pdfThumbnailViewer) {\n    this.pdfThumbnailViewer = pdfThumbnailViewer;\n  }\n\n  /**\n   * @param {IRenderableView} view\n   * @returns {boolean}\n   */\n  isHighestPriority(view) {\n    return this.highestPriorityPage === view.renderingId;\n  }\n\n  /**\n   * @param {Object} currentlyVisiblePages\n   */\n  renderHighestPriority(currentlyVisiblePages) {\n    if (this.idleTimeout) {\n      clearTimeout(this.idleTimeout);\n      this.idleTimeout = null;\n    }\n\n    // Pages have a higher priority than thumbnails, so check them first.\n    if (this.pdfViewer.forceRendering(currentlyVisiblePages)) {\n      return;\n    }\n    // No pages needed rendering, so check thumbnails.\n    if (this.pdfThumbnailViewer && this.isThumbnailViewEnabled) {\n      if (this.pdfThumbnailViewer.forceRendering()) {\n        return;\n      }\n    }\n\n    if (this.printing) {\n      // If printing is currently ongoing do not reschedule cleanup.\n      return;\n    }\n\n    if (this.onIdle) {\n      this.idleTimeout = setTimeout(this.onIdle.bind(this), CLEANUP_TIMEOUT);\n    }\n  }\n\n  /**\n   * @param {Object} visible\n   * @param {Array} views\n   * @param {boolean} scrolledDown\n   */\n  getHighestPriority(visible, views, scrolledDown) {\n    /**\n     * The state has changed. Figure out which page has the highest priority to\n     * render next (if any).\n     *\n     * Priority:\n     * 1. visible pages\n     * 2. if last scrolled down, the page after the visible pages, or\n     *    if last scrolled up, the page before the visible pages\n     */\n    let visibleViews = visible.views;\n\n    let numVisible = visibleViews.length;\n    if (numVisible === 0) {\n      return null;\n    }\n    for (let i = 0; i < numVisible; ++i) {\n      let view = visibleViews[i].view;\n      if (!this.isViewFinished(view)) {\n        return view;\n      }\n    }\n\n    // All the visible views have rendered; try to render next/previous pages.\n    if (scrolledDown) {\n      let nextPageIndex = visible.last.id;\n      // IDs start at 1, so no need to add 1.\n      if (views[nextPageIndex] && !this.isViewFinished(views[nextPageIndex])) {\n        return views[nextPageIndex];\n      }\n    } else {\n      let previousPageIndex = visible.first.id - 2;\n      if (views[previousPageIndex] &&\n          !this.isViewFinished(views[previousPageIndex])) {\n        return views[previousPageIndex];\n      }\n    }\n    // Everything that needs to be rendered has been.\n    return null;\n  }\n\n  /**\n   * @param {IRenderableView} view\n   * @returns {boolean}\n   */\n  isViewFinished(view) {\n    return view.renderingState === RenderingStates.FINISHED;\n  }\n\n  /**\n   * Render a page or thumbnail view. This calls the appropriate function\n   * based on the views state. If the view is already rendered it will return\n   * `false`.\n   *\n   * @param {IRenderableView} view\n   */\n  renderView(view) {\n    switch (view.renderingState) {\n      case RenderingStates.FINISHED:\n        return false;\n      case RenderingStates.PAUSED:\n        this.highestPriorityPage = view.renderingId;\n        view.resume();\n        break;\n      case RenderingStates.RUNNING:\n        this.highestPriorityPage = view.renderingId;\n        break;\n      case RenderingStates.INITIAL:\n        this.highestPriorityPage = view.renderingId;\n        view.draw().finally(() => {\n          this.renderHighestPriority();\n        });\n        break;\n    }\n    return true;\n  }\n}\n\nexport {\n  RenderingStates,\n  PDFRenderingQueue,\n};\n","/* Copyright 2018 Mozilla Foundation\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *     http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nlet compatibilityParams = Object.create(null);\nif (typeof PDFJSDev === 'undefined' || PDFJSDev.test('GENERIC')) {\n  const userAgent =\n    (typeof navigator !== 'undefined' && navigator.userAgent) || '';\n  const isAndroid = /Android/.test(userAgent);\n  const isIOS = /\\b(iPad|iPhone|iPod)(?=;)/.test(userAgent);\n\n  // Limit canvas size to 5 mega-pixels on mobile.\n  // Support: Android, iOS\n  (function checkCanvasSizeLimitation() {\n    if (isIOS || isAndroid) {\n      compatibilityParams.maxCanvasPixels = 5242880;\n    }\n  })();\n}\n\nexports.viewerCompatibilityParams = Object.freeze(compatibilityParams);\n","/* Copyright 2017 Mozilla Foundation\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *     http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { BaseViewer } from './base_viewer';\nimport { shadow } from 'pdfjs-lib';\n\nclass PDFSinglePageViewer extends BaseViewer {\n  constructor(options) {\n    super(options);\n\n    this.eventBus.on('pagesinit', (evt) => {\n      // Since the pages are placed in a `DocumentFragment`, make sure that\n      // the current page becomes visible upon loading of the document.\n      this._ensurePageViewVisible();\n    });\n  }\n\n  get _setDocumentViewerElement() {\n    // Since we only want to display *one* page at a time when using the\n    // `PDFSinglePageViewer`, we cannot append them to the `viewer` DOM element.\n    // Instead, they are placed in a `DocumentFragment`, and only the current\n    // page is displayed in the viewer (refer to `this._ensurePageViewVisible`).\n    return shadow(this, '_setDocumentViewerElement', this._shadowViewer);\n  }\n\n  _resetView() {\n    super._resetView();\n    this._previousPageNumber = 1;\n    this._shadowViewer = document.createDocumentFragment();\n    this._updateScrollDown = null;\n  }\n\n  _ensurePageViewVisible() {\n    let pageView = this._pages[this._currentPageNumber - 1];\n    let previousPageView = this._pages[this._previousPageNumber - 1];\n\n    let viewerNodes = this.viewer.childNodes;\n    switch (viewerNodes.length) {\n      case 0: // Should *only* occur on initial loading.\n        this.viewer.appendChild(pageView.div);\n        break;\n      case 1: // The normal page-switching case.\n        if (viewerNodes[0] !== previousPageView.div) {\n          throw new Error(\n            '_ensurePageViewVisible: Unexpected previously visible page.');\n        }\n        if (pageView === previousPageView) {\n          break; // The correct page is already visible.\n        }\n        // Switch visible pages, and reset the viewerContainer scroll position.\n        this._shadowViewer.appendChild(previousPageView.div);\n        this.viewer.appendChild(pageView.div);\n\n        this.container.scrollTop = 0;\n        break;\n      default:\n        throw new Error(\n          '_ensurePageViewVisible: Only one page should be visible at a time.');\n    }\n    this._previousPageNumber = this._currentPageNumber;\n  }\n\n  _scrollUpdate() {\n    if (this._updateScrollDown) {\n      this._updateScrollDown();\n    }\n    super._scrollUpdate();\n  }\n\n  _scrollIntoView({ pageDiv, pageSpot = null, pageNumber = null, }) {\n    if (pageNumber) { // Ensure that `this._currentPageNumber` is correct.\n      this._setCurrentPageNumber(pageNumber);\n    }\n    const scrolledDown = this._currentPageNumber >= this._previousPageNumber;\n\n    this._ensurePageViewVisible();\n    // Ensure that rendering always occurs, to avoid showing a blank page,\n    // even if the current position doesn't change when the page is scrolled.\n    this.update();\n\n    super._scrollIntoView({ pageDiv, pageSpot, pageNumber, });\n\n    // Since scrolling is tracked using `requestAnimationFrame`, update the\n    // scroll direction during the next `this._scrollUpdate` invocation.\n    this._updateScrollDown = () => {\n      this.scroll.down = scrolledDown;\n      this._updateScrollDown = null;\n    };\n  }\n\n  _getVisiblePages() {\n    return this._getCurrentVisiblePage();\n  }\n\n  _updateHelper(visiblePages) { }\n\n  get _isScrollModeHorizontal() {\n    // The Scroll/Spread modes are never used in `PDFSinglePageViewer`.\n    return shadow(this, '_isScrollModeHorizontal', false);\n  }\n\n  _updateScrollMode() { }\n\n  _updateSpreadMode() { }\n}\n\nexport {\n  PDFSinglePageViewer,\n};\n","/* Copyright 2014 Mozilla Foundation\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *     http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport {\n  CSS_UNITS, DEFAULT_SCALE, DEFAULT_SCALE_VALUE, getGlobalEventBus,\n  getVisibleElements, isPortraitOrientation, isValidRotation, isValidScrollMode,\n  isValidSpreadMode, MAX_AUTO_SCALE, moveToEndOfArray, NullL10n,\n  PresentationModeState, RendererType, SCROLLBAR_PADDING, scrollIntoView,\n  ScrollMode, SpreadMode, TextLayerMode, UNKNOWN_SCALE, VERTICAL_PADDING,\n  watchScroll\n} from './ui_utils';\nimport { PDFRenderingQueue, RenderingStates } from './pdf_rendering_queue';\nimport { AnnotationLayerBuilder } from './annotation_layer_builder';\nimport { createPromiseCapability } from 'pdfjs-lib';\nimport { PDFPageView } from './pdf_page_view';\nimport { SimpleLinkService } from './pdf_link_service';\nimport { TextLayerBuilder } from './text_layer_builder';\n\nconst DEFAULT_CACHE_SIZE = 10;\n\n/**\n * @typedef {Object} PDFViewerOptions\n * @property {HTMLDivElement} container - The container for the viewer element.\n * @property {HTMLDivElement} viewer - (optional) The viewer element.\n * @property {EventBus} eventBus - The application event bus.\n * @property {IPDFLinkService} linkService - The navigation/linking service.\n * @property {DownloadManager} downloadManager - (optional) The download\n *   manager component.\n * @property {PDFFindController} findController - (optional) The find\n *   controller component.\n * @property {PDFRenderingQueue} renderingQueue - (optional) The rendering\n *   queue object.\n * @property {boolean} removePageBorders - (optional) Removes the border shadow\n *   around the pages. The default value is `false`.\n * @property {number} textLayerMode - (optional) Controls if the text layer used\n *   for selection and searching is created, and if the improved text selection\n *   behaviour is enabled. The constants from {TextLayerMode} should be used.\n *   The default value is `TextLayerMode.ENABLE`.\n * @property {string} imageResourcesPath - (optional) Path for image resources,\n *   mainly for annotation icons. Include trailing slash.\n * @property {boolean} renderInteractiveForms - (optional) Enables rendering of\n *   interactive form elements. The default is `false`.\n * @property {boolean} enablePrintAutoRotate - (optional) Enables automatic\n *   rotation of pages whose orientation differ from the first page upon\n *   printing. The default is `false`.\n * @property {string} renderer - 'canvas' or 'svg'. The default is 'canvas'.\n * @property {boolean} enableWebGL - (optional) Enables WebGL accelerated\n *   rendering for some operations. The default value is `false`.\n * @property {boolean} useOnlyCssZoom - (optional) Enables CSS only zooming.\n *   The default value is `false`.\n * @property {number} maxCanvasPixels - (optional) The maximum supported canvas\n *   size in total pixels, i.e. width * height. Use -1 for no limit.\n *   The default value is 4096 * 4096 (16 mega-pixels).\n * @property {IL10n} l10n - Localization service.\n */\n\nfunction PDFPageViewBuffer(size) {\n  let data = [];\n  this.push = function(view) {\n    let i = data.indexOf(view);\n    if (i >= 0) {\n      data.splice(i, 1);\n    }\n    data.push(view);\n    if (data.length > size) {\n      data.shift().destroy();\n    }\n  };\n  /**\n   * After calling resize, the size of the buffer will be newSize. The optional\n   * parameter pagesToKeep is, if present, an array of pages to push to the back\n   * of the buffer, delaying their destruction. The size of pagesToKeep has no\n   * impact on the final size of the buffer; if pagesToKeep has length larger\n   * than newSize, some of those pages will be destroyed anyway.\n   */\n  this.resize = function(newSize, pagesToKeep) {\n    size = newSize;\n    if (pagesToKeep) {\n      const pageIdsToKeep = new Set();\n      for (let i = 0, iMax = pagesToKeep.length; i < iMax; ++i) {\n        pageIdsToKeep.add(pagesToKeep[i].id);\n      }\n      moveToEndOfArray(data, function(page) {\n        return pageIdsToKeep.has(page.id);\n      });\n    }\n    while (data.length > size) {\n      data.shift().destroy();\n    }\n  };\n}\n\nfunction isSameScale(oldScale, newScale) {\n  if (newScale === oldScale) {\n    return true;\n  }\n  if (Math.abs(newScale - oldScale) < 1e-15) {\n    // Prevent unnecessary re-rendering of all pages when the scale\n    // changes only because of limited numerical precision.\n    return true;\n  }\n  return false;\n}\n\n/**\n * Simple viewer control to display PDF content/pages.\n * @implements {IRenderableView}\n */\nclass BaseViewer {\n  /**\n   * @param {PDFViewerOptions} options\n   */\n  constructor(options) {\n    if (this.constructor === BaseViewer) {\n      throw new Error('Cannot initialize BaseViewer.');\n    }\n    this._name = this.constructor.name;\n\n    this.container = options.container;\n    this.viewer = options.viewer || options.container.firstElementChild;\n    this.eventBus = options.eventBus || getGlobalEventBus();\n    this.linkService = options.linkService || new SimpleLinkService();\n    this.downloadManager = options.downloadManager || null;\n    this.findController = options.findController || null;\n    this.removePageBorders = options.removePageBorders || false;\n    this.textLayerMode = Number.isInteger(options.textLayerMode) ?\n      options.textLayerMode : TextLayerMode.ENABLE;\n    this.imageResourcesPath = options.imageResourcesPath || '';\n    this.renderInteractiveForms = options.renderInteractiveForms || false;\n    this.enablePrintAutoRotate = options.enablePrintAutoRotate || false;\n    this.renderer = options.renderer || RendererType.CANVAS;\n    this.enableWebGL = options.enableWebGL || false;\n    this.useOnlyCssZoom = options.useOnlyCssZoom || false;\n    this.maxCanvasPixels = options.maxCanvasPixels;\n    this.l10n = options.l10n || NullL10n;\n\n    this.defaultRenderingQueue = !options.renderingQueue;\n    if (this.defaultRenderingQueue) {\n      // Custom rendering queue is not specified, using default one\n      this.renderingQueue = new PDFRenderingQueue();\n      this.renderingQueue.setViewer(this);\n    } else {\n      this.renderingQueue = options.renderingQueue;\n    }\n\n    this.scroll = watchScroll(this.container, this._scrollUpdate.bind(this));\n    this.presentationModeState = PresentationModeState.UNKNOWN;\n    this._resetView();\n\n    if (this.removePageBorders) {\n      this.viewer.classList.add('removePageBorders');\n    }\n    // Defer the dispatching of this event, to give other viewer components\n    // time to initialize *and* register 'baseviewerinit' event listeners.\n    Promise.resolve().then(() => {\n      this.eventBus.dispatch('baseviewerinit', { source: this, });\n    });\n  }\n\n  get pagesCount() {\n    return this._pages.length;\n  }\n\n  getPageView(index) {\n    return this._pages[index];\n  }\n\n  /**\n   * @returns {boolean} true if all {PDFPageView} objects are initialized.\n   */\n  get pageViewsReady() {\n    return this._pageViewsReady;\n  }\n\n  /**\n   * @returns {number}\n   */\n  get currentPageNumber() {\n    return this._currentPageNumber;\n  }\n\n  /**\n   * @param {number} val - The page number.\n   */\n  set currentPageNumber(val) {\n    if (!Number.isInteger(val)) {\n      throw new Error('Invalid page number.');\n    }\n    if (!this.pdfDocument) {\n      return;\n    }\n    // The intent can be to just reset a scroll position and/or scale.\n    if (!this._setCurrentPageNumber(val, /* resetCurrentPageView = */ true)) {\n      console.error(\n        `${this._name}.currentPageNumber: \"${val}\" is not a valid page.`);\n    }\n  }\n\n  /**\n   * @return {boolean} Whether the pageNumber is valid (within bounds).\n   * @private\n   */\n  _setCurrentPageNumber(val, resetCurrentPageView = false) {\n    if (this._currentPageNumber === val) {\n      if (resetCurrentPageView) {\n        this._resetCurrentPageView();\n      }\n      return true;\n    }\n\n    if (!(0 < val && val <= this.pagesCount)) {\n      return false;\n    }\n    this._currentPageNumber = val;\n\n    this.eventBus.dispatch('pagechanging', {\n      source: this,\n      pageNumber: val,\n      pageLabel: this._pageLabels && this._pageLabels[val - 1],\n    });\n\n    if (resetCurrentPageView) {\n      this._resetCurrentPageView();\n    }\n    return true;\n  }\n\n  /**\n   * @returns {string|null} Returns the current page label,\n   *                        or `null` if no page labels exist.\n   */\n  get currentPageLabel() {\n    return this._pageLabels && this._pageLabels[this._currentPageNumber - 1];\n  }\n\n  /**\n   * @param {string} val - The page label.\n   */\n  set currentPageLabel(val) {\n    if (!this.pdfDocument) {\n      return;\n    }\n    let page = val | 0; // Fallback page number.\n    if (this._pageLabels) {\n      let i = this._pageLabels.indexOf(val);\n      if (i >= 0) {\n        page = i + 1;\n      }\n    }\n    // The intent can be to just reset a scroll position and/or scale.\n    if (!this._setCurrentPageNumber(page, /* resetCurrentPageView = */ true)) {\n      console.error(\n        `${this._name}.currentPageLabel: \"${val}\" is not a valid page.`);\n    }\n  }\n\n  /**\n   * @returns {number}\n   */\n  get currentScale() {\n    return this._currentScale !== UNKNOWN_SCALE ? this._currentScale :\n                                                  DEFAULT_SCALE;\n  }\n\n  /**\n   * @param {number} val - Scale of the pages in percents.\n   */\n  set currentScale(val) {\n    if (isNaN(val)) {\n      throw new Error('Invalid numeric scale.');\n    }\n    if (!this.pdfDocument) {\n      return;\n    }\n    this._setScale(val, false);\n  }\n\n  /**\n   * @returns {string}\n   */\n  get currentScaleValue() {\n    return this._currentScaleValue;\n  }\n\n  /**\n   * @param val - The scale of the pages (in percent or predefined value).\n   */\n  set currentScaleValue(val) {\n    if (!this.pdfDocument) {\n      return;\n    }\n    this._setScale(val, false);\n  }\n\n  /**\n   * @returns {number}\n   */\n  get pagesRotation() {\n    return this._pagesRotation;\n  }\n\n  /**\n   * @param {number} rotation - The rotation of the pages (0, 90, 180, 270).\n   */\n  set pagesRotation(rotation) {\n    if (!isValidRotation(rotation)) {\n      throw new Error('Invalid pages rotation angle.');\n    }\n    if (!this.pdfDocument) {\n      return;\n    }\n    if (this._pagesRotation === rotation) {\n      return; // The rotation didn't change.\n    }\n    this._pagesRotation = rotation;\n\n    let pageNumber = this._currentPageNumber;\n\n    for (let i = 0, ii = this._pages.length; i < ii; i++) {\n      let pageView = this._pages[i];\n      pageView.update(pageView.scale, rotation);\n    }\n    // Prevent errors in case the rotation changes *before* the scale has been\n    // set to a non-default value.\n    if (this._currentScaleValue) {\n      this._setScale(this._currentScaleValue, true);\n    }\n\n    this.eventBus.dispatch('rotationchanging', {\n      source: this,\n      pagesRotation: rotation,\n      pageNumber,\n    });\n\n    if (this.defaultRenderingQueue) {\n      this.update();\n    }\n  }\n\n  get _setDocumentViewerElement() {\n    // In most viewers, e.g. `PDFViewer`, this should return `this.viewer`.\n    throw new Error('Not implemented: _setDocumentViewerElement');\n  }\n\n  /**\n   * @param pdfDocument {PDFDocument}\n   */\n  setDocument(pdfDocument) {\n    if (this.pdfDocument) {\n      this._cancelRendering();\n      this._resetView();\n\n      if (this.findController) {\n        this.findController.setDocument(null);\n      }\n    }\n\n    this.pdfDocument = pdfDocument;\n    if (!pdfDocument) {\n      return;\n    }\n    let pagesCount = pdfDocument.numPages;\n\n    let pagesCapability = createPromiseCapability();\n    this.pagesPromise = pagesCapability.promise;\n\n    pagesCapability.promise.then(() => {\n      this._pageViewsReady = true;\n      this.eventBus.dispatch('pagesloaded', {\n        source: this,\n        pagesCount,\n      });\n    });\n\n    const onePageRenderedCapability = createPromiseCapability();\n    this.onePageRendered = onePageRenderedCapability.promise;\n\n    let bindOnAfterAndBeforeDraw = (pageView) => {\n      pageView.onBeforeDraw = () => {\n        // Add the page to the buffer at the start of drawing. That way it can\n        // be evicted from the buffer and destroyed even if we pause its\n        // rendering.\n        this._buffer.push(pageView);\n      };\n      pageView.onAfterDraw = () => {\n        if (!onePageRenderedCapability.settled) {\n          onePageRenderedCapability.resolve();\n        }\n      };\n    };\n\n    let firstPagePromise = pdfDocument.getPage(1);\n    this.firstPagePromise = firstPagePromise;\n\n    // Fetch a single page so we can get a viewport that will be the default\n    // viewport for all pages\n    firstPagePromise.then((pdfPage) => {\n      let scale = this.currentScale;\n      let viewport = pdfPage.getViewport({ scale: scale * CSS_UNITS, });\n      for (let pageNum = 1; pageNum <= pagesCount; ++pageNum) {\n        let textLayerFactory = null;\n        if (this.textLayerMode !== TextLayerMode.DISABLE) {\n          textLayerFactory = this;\n        }\n        let pageView = new PDFPageView({\n          container: this._setDocumentViewerElement,\n          eventBus: this.eventBus,\n          id: pageNum,\n          scale,\n          defaultViewport: viewport.clone(),\n          renderingQueue: this.renderingQueue,\n          textLayerFactory,\n          textLayerMode: this.textLayerMode,\n          annotationLayerFactory: this,\n          imageResourcesPath: this.imageResourcesPath,\n          renderInteractiveForms: this.renderInteractiveForms,\n          renderer: this.renderer,\n          enableWebGL: this.enableWebGL,\n          useOnlyCssZoom: this.useOnlyCssZoom,\n          maxCanvasPixels: this.maxCanvasPixels,\n          l10n: this.l10n,\n        });\n        bindOnAfterAndBeforeDraw(pageView);\n        this._pages.push(pageView);\n      }\n      if (this._spreadMode !== SpreadMode.NONE) {\n        this._updateSpreadMode();\n      }\n\n      // Fetch all the pages since the viewport is needed before printing\n      // starts to create the correct size canvas. Wait until one page is\n      // rendered so we don't tie up too many resources early on.\n      onePageRenderedCapability.promise.then(() => {\n        if (this.findController) {\n          this.findController.setDocument(pdfDocument); // Enable searching.\n        }\n\n        if (pdfDocument.loadingParams['disableAutoFetch']) {\n          // XXX: Printing is semi-broken with auto fetch disabled.\n          pagesCapability.resolve();\n          return;\n        }\n        let getPagesLeft = pagesCount;\n        for (let pageNum = 1; pageNum <= pagesCount; ++pageNum) {\n          pdfDocument.getPage(pageNum).then((pdfPage) => {\n            let pageView = this._pages[pageNum - 1];\n            if (!pageView.pdfPage) {\n              pageView.setPdfPage(pdfPage);\n            }\n            this.linkService.cachePageRef(pageNum, pdfPage.ref);\n            if (--getPagesLeft === 0) {\n              pagesCapability.resolve();\n            }\n          }, (reason) => {\n            console.error(`Unable to get page ${pageNum} to initialize viewer`,\n                          reason);\n            if (--getPagesLeft === 0) {\n              pagesCapability.resolve();\n            }\n          });\n        }\n      });\n\n      this.eventBus.dispatch('pagesinit', { source: this, });\n\n      if (this.defaultRenderingQueue) {\n        this.update();\n      }\n    }).catch((reason) => {\n      console.error('Unable to initialize viewer', reason);\n    });\n  }\n\n  /**\n   * @param {Array|null} labels\n   */\n  setPageLabels(labels) {\n    if (!this.pdfDocument) {\n      return;\n    }\n    if (!labels) {\n      this._pageLabels = null;\n    } else if (!(Array.isArray(labels) &&\n                 this.pdfDocument.numPages === labels.length)) {\n      this._pageLabels = null;\n      console.error(`${this._name}.setPageLabels: Invalid page labels.`);\n    } else {\n      this._pageLabels = labels;\n    }\n    // Update all the `PDFPageView` instances.\n    for (let i = 0, ii = this._pages.length; i < ii; i++) {\n      let pageView = this._pages[i];\n      let label = this._pageLabels && this._pageLabels[i];\n      pageView.setPageLabel(label);\n    }\n  }\n\n  _resetView() {\n    this._pages = [];\n    this._currentPageNumber = 1;\n    this._currentScale = UNKNOWN_SCALE;\n    this._currentScaleValue = null;\n    this._pageLabels = null;\n    this._buffer = new PDFPageViewBuffer(DEFAULT_CACHE_SIZE);\n    this._location = null;\n    this._pagesRotation = 0;\n    this._pagesRequests = [];\n    this._pageViewsReady = false;\n    this._scrollMode = ScrollMode.VERTICAL;\n    this._spreadMode = SpreadMode.NONE;\n\n    // Remove the pages from the DOM...\n    this.viewer.textContent = '';\n    // ... and reset the Scroll mode CSS class(es) afterwards.\n    this._updateScrollMode();\n  }\n\n  _scrollUpdate() {\n    if (this.pagesCount === 0) {\n      return;\n    }\n    this.update();\n  }\n\n  _scrollIntoView({ pageDiv, pageSpot = null, pageNumber = null, }) {\n    scrollIntoView(pageDiv, pageSpot);\n  }\n\n  _setScaleUpdatePages(newScale, newValue, noScroll = false, preset = false) {\n    this._currentScaleValue = newValue.toString();\n\n    if (isSameScale(this._currentScale, newScale)) {\n      if (preset) {\n        this.eventBus.dispatch('scalechanging', {\n          source: this,\n          scale: newScale,\n          presetValue: newValue,\n        });\n      }\n      return;\n    }\n\n    for (let i = 0, ii = this._pages.length; i < ii; i++) {\n      this._pages[i].update(newScale);\n    }\n    this._currentScale = newScale;\n\n    if (!noScroll) {\n      let page = this._currentPageNumber, dest;\n      if (this._location &&\n          !(this.isInPresentationMode || this.isChangingPresentationMode)) {\n        page = this._location.pageNumber;\n        dest = [null, { name: 'XYZ', }, this._location.left,\n                this._location.top, null];\n      }\n      this.scrollPageIntoView({\n        pageNumber: page,\n        destArray: dest,\n        allowNegativeOffset: true,\n      });\n    }\n\n    this.eventBus.dispatch('scalechanging', {\n      source: this,\n      scale: newScale,\n      presetValue: preset ? newValue : undefined,\n    });\n\n    if (this.defaultRenderingQueue) {\n      this.update();\n    }\n  }\n\n  _setScale(value, noScroll = false) {\n    let scale = parseFloat(value);\n\n    if (scale > 0) {\n      this._setScaleUpdatePages(scale, value, noScroll, /* preset = */ false);\n    } else {\n      let currentPage = this._pages[this._currentPageNumber - 1];\n      if (!currentPage) {\n        return;\n      }\n      const noPadding = (this.isInPresentationMode || this.removePageBorders);\n      let hPadding = noPadding ? 0 : SCROLLBAR_PADDING;\n      let vPadding = noPadding ? 0 : VERTICAL_PADDING;\n\n      if (!noPadding && this._isScrollModeHorizontal) {\n        [hPadding, vPadding] = [vPadding, hPadding]; // Swap the padding values.\n      }\n      let pageWidthScale = (this.container.clientWidth - hPadding) /\n                           currentPage.width * currentPage.scale;\n      let pageHeightScale = (this.container.clientHeight - vPadding) /\n                            currentPage.height * currentPage.scale;\n      switch (value) {\n        case 'page-actual':\n          scale = 1;\n          break;\n        case 'page-width':\n          scale = pageWidthScale;\n          break;\n        case 'page-height':\n          scale = pageHeightScale;\n          break;\n        case 'page-fit':\n          scale = Math.min(pageWidthScale, pageHeightScale);\n          break;\n        case 'auto':\n          // For pages in landscape mode, fit the page height to the viewer\n          // *unless* the page would thus become too wide to fit horizontally.\n          let horizontalScale = isPortraitOrientation(currentPage) ?\n            pageWidthScale : Math.min(pageHeightScale, pageWidthScale);\n          scale = Math.min(MAX_AUTO_SCALE, horizontalScale);\n          break;\n        default:\n          console.error(\n            `${this._name}._setScale: \"${value}\" is an unknown zoom value.`);\n          return;\n      }\n      this._setScaleUpdatePages(scale, value, noScroll, /* preset = */ true);\n    }\n  }\n\n  /**\n   * Refreshes page view: scrolls to the current page and updates the scale.\n   * @private\n   */\n  _resetCurrentPageView() {\n    if (this.isInPresentationMode) {\n      // Fixes the case when PDF has different page sizes.\n      this._setScale(this._currentScaleValue, true);\n    }\n\n    let pageView = this._pages[this._currentPageNumber - 1];\n    this._scrollIntoView({ pageDiv: pageView.div, });\n  }\n\n  /**\n   * @typedef ScrollPageIntoViewParameters\n   * @property {number} pageNumber - The page number.\n   * @property {Array} destArray - (optional) The original PDF destination\n   *   array, in the format: <page-ref> </XYZ|/FitXXX> <args..>\n   * @property {boolean} allowNegativeOffset - (optional) Allow negative page\n   *   offsets. The default value is `false`.\n   */\n\n  /**\n   * Scrolls page into view.\n   * @param {ScrollPageIntoViewParameters} params\n   */\n  scrollPageIntoView({ pageNumber, destArray = null,\n                       allowNegativeOffset = false, }) {\n    if (!this.pdfDocument) {\n      return;\n    }\n    const pageView = (Number.isInteger(pageNumber) &&\n                      this._pages[pageNumber - 1]);\n    if (!pageView) {\n      console.error(`${this._name}.scrollPageIntoView: ` +\n        `\"${pageNumber}\" is not a valid pageNumber parameter.`);\n      return;\n    }\n\n    if (this.isInPresentationMode || !destArray) {\n      this._setCurrentPageNumber(pageNumber, /* resetCurrentPageView = */ true);\n      return;\n    }\n    let x = 0, y = 0;\n    let width = 0, height = 0, widthScale, heightScale;\n    let changeOrientation = (pageView.rotation % 180 === 0 ? false : true);\n    let pageWidth = (changeOrientation ? pageView.height : pageView.width) /\n      pageView.scale / CSS_UNITS;\n    let pageHeight = (changeOrientation ? pageView.width : pageView.height) /\n      pageView.scale / CSS_UNITS;\n    let scale = 0;\n    switch (destArray[1].name) {\n      case 'XYZ':\n        x = destArray[2];\n        y = destArray[3];\n        scale = destArray[4];\n        // If x and/or y coordinates are not supplied, default to\n        // _top_ left of the page (not the obvious bottom left,\n        // since aligning the bottom of the intended page with the\n        // top of the window is rarely helpful).\n        x = x !== null ? x : 0;\n        y = y !== null ? y : pageHeight;\n        break;\n      case 'Fit':\n      case 'FitB':\n        scale = 'page-fit';\n        break;\n      case 'FitH':\n      case 'FitBH':\n        y = destArray[2];\n        scale = 'page-width';\n        // According to the PDF spec, section 12.3.2.2, a `null` value in the\n        // parameter should maintain the position relative to the new page.\n        if (y === null && this._location) {\n          x = this._location.left;\n          y = this._location.top;\n        }\n        break;\n      case 'FitV':\n      case 'FitBV':\n        x = destArray[2];\n        width = pageWidth;\n        height = pageHeight;\n        scale = 'page-height';\n        break;\n      case 'FitR':\n        x = destArray[2];\n        y = destArray[3];\n        width = destArray[4] - x;\n        height = destArray[5] - y;\n        let hPadding = this.removePageBorders ? 0 : SCROLLBAR_PADDING;\n        let vPadding = this.removePageBorders ? 0 : VERTICAL_PADDING;\n\n        widthScale = (this.container.clientWidth - hPadding) /\n          width / CSS_UNITS;\n        heightScale = (this.container.clientHeight - vPadding) /\n          height / CSS_UNITS;\n        scale = Math.min(Math.abs(widthScale), Math.abs(heightScale));\n        break;\n      default:\n        console.error(`${this._name}.scrollPageIntoView: ` +\n          `\"${destArray[1].name}\" is not a valid destination type.`);\n        return;\n    }\n\n    if (scale && scale !== this._currentScale) {\n      this.currentScaleValue = scale;\n    } else if (this._currentScale === UNKNOWN_SCALE) {\n      this.currentScaleValue = DEFAULT_SCALE_VALUE;\n    }\n\n    if (scale === 'page-fit' && !destArray[4]) {\n      this._scrollIntoView({\n        pageDiv: pageView.div,\n        pageNumber,\n      });\n      return;\n    }\n\n    let boundingRect = [\n      pageView.viewport.convertToViewportPoint(x, y),\n      pageView.viewport.convertToViewportPoint(x + width, y + height)\n    ];\n    let left = Math.min(boundingRect[0][0], boundingRect[1][0]);\n    let top = Math.min(boundingRect[0][1], boundingRect[1][1]);\n\n    if (!allowNegativeOffset) {\n      // Some bad PDF generators will create destinations with e.g. top values\n      // that exceeds the page height. Ensure that offsets are not negative,\n      // to prevent a previous page from becoming visible (fixes bug 874482).\n      left = Math.max(left, 0);\n      top = Math.max(top, 0);\n    }\n    this._scrollIntoView({\n      pageDiv: pageView.div,\n      pageSpot: { left, top, },\n      pageNumber,\n    });\n  }\n\n  _updateLocation(firstPage) {\n    let currentScale = this._currentScale;\n    let currentScaleValue = this._currentScaleValue;\n    let normalizedScaleValue =\n      parseFloat(currentScaleValue) === currentScale ?\n      Math.round(currentScale * 10000) / 100 : currentScaleValue;\n\n    let pageNumber = firstPage.id;\n    let pdfOpenParams = '#page=' + pageNumber;\n    pdfOpenParams += '&zoom=' + normalizedScaleValue;\n    let currentPageView = this._pages[pageNumber - 1];\n    let container = this.container;\n    let topLeft = currentPageView.getPagePoint(\n      (container.scrollLeft - firstPage.x),\n      (container.scrollTop - firstPage.y));\n    let intLeft = Math.round(topLeft[0]);\n    let intTop = Math.round(topLeft[1]);\n    pdfOpenParams += ',' + intLeft + ',' + intTop;\n\n    this._location = {\n      pageNumber,\n      scale: normalizedScaleValue,\n      top: intTop,\n      left: intLeft,\n      rotation: this._pagesRotation,\n      pdfOpenParams,\n    };\n  }\n\n  _updateHelper(visiblePages) {\n    throw new Error('Not implemented: _updateHelper');\n  }\n\n  update() {\n    const visible = this._getVisiblePages();\n    const visiblePages = visible.views, numVisiblePages = visiblePages.length;\n\n    if (numVisiblePages === 0) {\n      return;\n    }\n    const newCacheSize = Math.max(DEFAULT_CACHE_SIZE, 2 * numVisiblePages + 1);\n    this._buffer.resize(newCacheSize, visiblePages);\n\n    this.renderingQueue.renderHighestPriority(visible);\n\n    this._updateHelper(visiblePages); // Run any class-specific update code.\n\n    this._updateLocation(visible.first);\n    this.eventBus.dispatch('updateviewarea', {\n      source: this,\n      location: this._location,\n    });\n  }\n\n  containsElement(element) {\n    return this.container.contains(element);\n  }\n\n  focus() {\n    this.container.focus();\n  }\n\n  get _isScrollModeHorizontal() {\n    // Used to ensure that pre-rendering of the next/previous page works\n    // correctly, since Scroll/Spread modes are ignored in Presentation Mode.\n    return (this.isInPresentationMode ?\n            false : this._scrollMode === ScrollMode.HORIZONTAL);\n  }\n\n  get isInPresentationMode() {\n    return this.presentationModeState === PresentationModeState.FULLSCREEN;\n  }\n\n  get isChangingPresentationMode() {\n    return this.presentationModeState === PresentationModeState.CHANGING;\n  }\n\n  get isHorizontalScrollbarEnabled() {\n    return (this.isInPresentationMode ?\n      false : (this.container.scrollWidth > this.container.clientWidth));\n  }\n\n  get isVerticalScrollbarEnabled() {\n    return (this.isInPresentationMode ?\n      false : (this.container.scrollHeight > this.container.clientHeight));\n  }\n\n  /**\n   * Helper method for `this._getVisiblePages`. Should only ever be used when\n   * the viewer can only display a single page at a time, for example in:\n   *  - `PDFSinglePageViewer`.\n   *  - `PDFViewer` with Presentation Mode active.\n   */\n  _getCurrentVisiblePage() {\n    if (!this.pagesCount) {\n      return { views: [], };\n    }\n    const pageView = this._pages[this._currentPageNumber - 1];\n    // NOTE: Compute the `x` and `y` properties of the current view,\n    // since `this._updateLocation` depends of them being available.\n    const element = pageView.div;\n\n    const view = {\n      id: pageView.id,\n      x: element.offsetLeft + element.clientLeft,\n      y: element.offsetTop + element.clientTop,\n      view: pageView,\n    };\n    return { first: view, last: view, views: [view], };\n  }\n\n  _getVisiblePages() {\n    return getVisibleElements(this.container, this._pages, true,\n                              this._isScrollModeHorizontal);\n  }\n\n  /**\n   * @param {number} pageNumber\n   */\n  isPageVisible(pageNumber) {\n    if (!this.pdfDocument) {\n      return false;\n    }\n    if (this.pageNumber < 1 || pageNumber > this.pagesCount) {\n      console.error(\n        `${this._name}.isPageVisible: \"${pageNumber}\" is out of bounds.`);\n      return false;\n    }\n    return this._getVisiblePages().views.some(function(view) {\n      return (view.id === pageNumber);\n    });\n  }\n\n  cleanup() {\n    for (let i = 0, ii = this._pages.length; i < ii; i++) {\n      if (this._pages[i] &&\n          this._pages[i].renderingState !== RenderingStates.FINISHED) {\n        this._pages[i].reset();\n      }\n    }\n  }\n\n  /**\n   * @private\n   */\n  _cancelRendering() {\n    for (let i = 0, ii = this._pages.length; i < ii; i++) {\n      if (this._pages[i]) {\n        this._pages[i].cancelRendering();\n      }\n    }\n  }\n\n  /**\n   * @param {PDFPageView} pageView\n   * @returns {Promise} Returns a promise containing a {PDFPageProxy} object.\n   * @private\n   */\n  _ensurePdfPageLoaded(pageView) {\n    if (pageView.pdfPage) {\n      return Promise.resolve(pageView.pdfPage);\n    }\n    let pageNumber = pageView.id;\n    if (this._pagesRequests[pageNumber]) {\n      return this._pagesRequests[pageNumber];\n    }\n    let promise = this.pdfDocument.getPage(pageNumber).then((pdfPage) => {\n      if (!pageView.pdfPage) {\n        pageView.setPdfPage(pdfPage);\n      }\n      this._pagesRequests[pageNumber] = null;\n      return pdfPage;\n    }).catch((reason) => {\n      console.error('Unable to get page for page view', reason);\n      // Page error -- there is nothing can be done.\n      this._pagesRequests[pageNumber] = null;\n    });\n    this._pagesRequests[pageNumber] = promise;\n    return promise;\n  }\n\n  forceRendering(currentlyVisiblePages) {\n    let visiblePages = currentlyVisiblePages || this._getVisiblePages();\n    let scrollAhead = (this._isScrollModeHorizontal ?\n                       this.scroll.right : this.scroll.down);\n    let pageView = this.renderingQueue.getHighestPriority(visiblePages,\n                                                          this._pages,\n                                                          scrollAhead);\n    if (pageView) {\n      this._ensurePdfPageLoaded(pageView).then(() => {\n        this.renderingQueue.renderView(pageView);\n      });\n      return true;\n    }\n    return false;\n  }\n\n  /**\n   * @param {HTMLDivElement} textLayerDiv\n   * @param {number} pageIndex\n   * @param {PageViewport} viewport\n   * @returns {TextLayerBuilder}\n   */\n  createTextLayerBuilder(textLayerDiv, pageIndex, viewport,\n                         enhanceTextSelection = false) {\n    return new TextLayerBuilder({\n      textLayerDiv,\n      eventBus: this.eventBus,\n      pageIndex,\n      viewport,\n      findController: this.isInPresentationMode ? null : this.findController,\n      enhanceTextSelection: this.isInPresentationMode ? false :\n                                                        enhanceTextSelection,\n    });\n  }\n\n  /**\n   * @param {HTMLDivElement} pageDiv\n   * @param {PDFPage} pdfPage\n   * @param {string} imageResourcesPath - (optional) Path for image resources,\n   *   mainly for annotation icons. Include trailing slash.\n   * @param {boolean} renderInteractiveForms\n   * @param {IL10n} l10n\n   * @returns {AnnotationLayerBuilder}\n   */\n  createAnnotationLayerBuilder(pageDiv, pdfPage, imageResourcesPath = '',\n                               renderInteractiveForms = false,\n                               l10n = NullL10n) {\n    return new AnnotationLayerBuilder({\n      pageDiv,\n      pdfPage,\n      imageResourcesPath,\n      renderInteractiveForms,\n      linkService: this.linkService,\n      downloadManager: this.downloadManager,\n      l10n,\n    });\n  }\n\n  /**\n   * @returns {boolean} Whether all pages of the PDF document have identical\n   *                    widths and heights.\n   */\n  get hasEqualPageSizes() {\n    let firstPageView = this._pages[0];\n    for (let i = 1, ii = this._pages.length; i < ii; ++i) {\n      let pageView = this._pages[i];\n      if (pageView.width !== firstPageView.width ||\n          pageView.height !== firstPageView.height) {\n        return false;\n      }\n    }\n    return true;\n  }\n\n  /**\n   * Returns sizes of the pages.\n   * @returns {Array} Array of objects with width/height/rotation fields.\n   */\n  getPagesOverview() {\n    let pagesOverview = this._pages.map(function(pageView) {\n      let viewport = pageView.pdfPage.getViewport({ scale: 1, });\n      return {\n        width: viewport.width,\n        height: viewport.height,\n        rotation: viewport.rotation,\n      };\n    });\n    if (!this.enablePrintAutoRotate) {\n      return pagesOverview;\n    }\n    let isFirstPagePortrait = isPortraitOrientation(pagesOverview[0]);\n    return pagesOverview.map(function (size) {\n      if (isFirstPagePortrait === isPortraitOrientation(size)) {\n        return size;\n      }\n      return {\n        width: size.height,\n        height: size.width,\n        rotation: (size.rotation + 90) % 360,\n      };\n    });\n  }\n\n  /**\n   * @return {number} One of the values in {ScrollMode}.\n   */\n  get scrollMode() {\n    return this._scrollMode;\n  }\n\n  /**\n   * @param {number} mode - The direction in which the document pages should be\n   *   laid out within the scrolling container.\n   *   The constants from {ScrollMode} should be used.\n   */\n  set scrollMode(mode) {\n    if (this._scrollMode === mode) {\n      return; // The Scroll mode didn't change.\n    }\n    if (!isValidScrollMode(mode)) {\n      throw new Error(`Invalid scroll mode: ${mode}`);\n    }\n    this._scrollMode = mode;\n    this.eventBus.dispatch('scrollmodechanged', { source: this, mode, });\n\n    this._updateScrollMode(/* pageNumber = */ this._currentPageNumber);\n  }\n\n  _updateScrollMode(pageNumber = null) {\n    const scrollMode = this._scrollMode, viewer = this.viewer;\n\n    viewer.classList.toggle('scrollHorizontal',\n                            scrollMode === ScrollMode.HORIZONTAL);\n    viewer.classList.toggle('scrollWrapped',\n                            scrollMode === ScrollMode.WRAPPED);\n\n    if (!this.pdfDocument || !pageNumber) {\n      return;\n    }\n    // Non-numeric scale values can be sensitive to the scroll orientation.\n    // Call this before re-scrolling to the current page, to ensure that any\n    // changes in scale don't move the current page.\n    if (this._currentScaleValue && isNaN(this._currentScaleValue)) {\n      this._setScale(this._currentScaleValue, true);\n    }\n    this._setCurrentPageNumber(pageNumber, /* resetCurrentPageView = */ true);\n    this.update();\n  }\n\n  /**\n   * @return {number} One of the values in {SpreadMode}.\n   */\n  get spreadMode() {\n    return this._spreadMode;\n  }\n\n  /**\n   * @param {number} mode - Group the pages in spreads, starting with odd- or\n   *   even-number pages (unless `SpreadMode.NONE` is used).\n   *   The constants from {SpreadMode} should be used.\n   */\n  set spreadMode(mode) {\n    if (this._spreadMode === mode) {\n      return; // The Spread mode didn't change.\n    }\n    if (!isValidSpreadMode(mode)) {\n      throw new Error(`Invalid spread mode: ${mode}`);\n    }\n    this._spreadMode = mode;\n    this.eventBus.dispatch('spreadmodechanged', { source: this, mode, });\n\n    this._updateSpreadMode(/* pageNumber = */ this._currentPageNumber);\n  }\n\n  _updateSpreadMode(pageNumber = null) {\n    if (!this.pdfDocument) {\n      return;\n    }\n    const viewer = this.viewer, pages = this._pages;\n    // Temporarily remove all the pages from the DOM.\n    viewer.textContent = '';\n\n    if (this._spreadMode === SpreadMode.NONE) {\n      for (let i = 0, iMax = pages.length; i < iMax; ++i) {\n        viewer.appendChild(pages[i].div);\n      }\n    } else {\n      const parity = this._spreadMode - 1;\n      let spread = null;\n      for (let i = 0, iMax = pages.length; i < iMax; ++i) {\n        if (spread === null) {\n          spread = document.createElement('div');\n          spread.className = 'spread';\n          viewer.appendChild(spread);\n        } else if (i % 2 === parity) {\n          spread = spread.cloneNode(false);\n          viewer.appendChild(spread);\n        }\n        spread.appendChild(pages[i].div);\n      }\n    }\n\n    if (!pageNumber) {\n      return;\n    }\n    this._setCurrentPageNumber(pageNumber, /* resetCurrentPageView = */ true);\n    this.update();\n  }\n}\n\nexport {\n  BaseViewer,\n};\n","/* Copyright 2014 Mozilla Foundation\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *     http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { BaseViewer } from './base_viewer';\nimport { shadow } from 'pdfjs-lib';\n\nclass PDFViewer extends BaseViewer {\n  get _setDocumentViewerElement() {\n    return shadow(this, '_setDocumentViewerElement', this.viewer);\n  }\n\n  _scrollIntoView({ pageDiv, pageSpot = null, pageNumber = null, }) {\n    if (!pageSpot && !this.isInPresentationMode) {\n      const left = pageDiv.offsetLeft + pageDiv.clientLeft;\n      const right = left + pageDiv.clientWidth;\n      const { scrollLeft, clientWidth, } = this.container;\n      if (this._isScrollModeHorizontal ||\n          left < scrollLeft || right > scrollLeft + clientWidth) {\n        pageSpot = { left: 0, top: 0, };\n      }\n    }\n    super._scrollIntoView({ pageDiv, pageSpot, pageNumber, });\n  }\n\n  _getVisiblePages() {\n    if (this.isInPresentationMode) {\n      // The algorithm in `getVisibleElements` doesn't work in all browsers and\n      // configurations (e.g. Chrome) when Presentation Mode is active.\n      return this._getCurrentVisiblePage();\n    }\n    return super._getVisiblePages();\n  }\n\n  _updateHelper(visiblePages) {\n    if (this.isInPresentationMode) {\n      return;\n    }\n    let currentId = this._currentPageNumber;\n    let stillFullyVisible = false;\n\n    for (const page of visiblePages) {\n      if (page.percent < 100) {\n        break;\n      }\n      if (page.id === currentId) {\n        stillFullyVisible = true;\n        break;\n      }\n    }\n    if (!stillFullyVisible) {\n      currentId = visiblePages[0].id;\n    }\n    this._setCurrentPageNumber(currentId);\n  }\n}\n\nexport {\n  PDFViewer,\n};\n"],"sourceRoot":""}